diff --git a/include/mbedtls/debug.h b/include/mbedtls/debug.h
index 922e5be..424ed4b 100644
--- a/include/mbedtls/debug.h
+++ b/include/mbedtls/debug.h
@@ -149,165 +149,8 @@
  */
 void mbedtls_debug_set_threshold(int threshold);
 
-/**
- * \brief    Print a message to the debug output. This function is always used
- *          through the MBEDTLS_SSL_DEBUG_MSG() macro, which supplies the ssl
- *          context, file and line number parameters.
- *
- * \param ssl       SSL context
- * \param level     error level of the debug message
- * \param file      file the message has occurred in
- * \param line      line number the message has occurred at
- * \param format    format specifier, in printf format
- * \param ...       variables used by the format specifier
- *
- * \attention       This function is intended for INTERNAL usage within the
- *                  library only.
- */
-void mbedtls_debug_print_msg(const mbedtls_ssl_context *ssl, int level,
-                             const char *file, int line,
-                             const char *format, ...) MBEDTLS_PRINTF_ATTRIBUTE(5, 6);
-
-/**
- * \brief   Print the return value of a function to the debug output. This
- *          function is always used through the MBEDTLS_SSL_DEBUG_RET() macro,
- *          which supplies the ssl context, file and line number parameters.
- *
- * \param ssl       SSL context
- * \param level     error level of the debug message
- * \param file      file the error has occurred in
- * \param line      line number the error has occurred in
- * \param text      the name of the function that returned the error
- * \param ret       the return code value
- *
- * \attention       This function is intended for INTERNAL usage within the
- *                  library only.
- */
-void mbedtls_debug_print_ret(const mbedtls_ssl_context *ssl, int level,
-                             const char *file, int line,
-                             const char *text, int ret);
-
-/**
- * \brief   Output a buffer of size len bytes to the debug output. This function
- *          is always used through the MBEDTLS_SSL_DEBUG_BUF() macro,
- *          which supplies the ssl context, file and line number parameters.
- *
- * \param ssl       SSL context
- * \param level     error level of the debug message
- * \param file      file the error has occurred in
- * \param line      line number the error has occurred in
- * \param text      a name or label for the buffer being dumped. Normally the
- *                  variable or buffer name
- * \param buf       the buffer to be outputted
- * \param len       length of the buffer
- *
- * \attention       This function is intended for INTERNAL usage within the
- *                  library only.
- */
-void mbedtls_debug_print_buf(const mbedtls_ssl_context *ssl, int level,
-                             const char *file, int line, const char *text,
-                             const unsigned char *buf, size_t len);
-
-#if defined(MBEDTLS_BIGNUM_C)
-/**
- * \brief   Print a MPI variable to the debug output. This function is always
- *          used through the MBEDTLS_SSL_DEBUG_MPI() macro, which supplies the
- *          ssl context, file and line number parameters.
- *
- * \param ssl       SSL context
- * \param level     error level of the debug message
- * \param file      file the error has occurred in
- * \param line      line number the error has occurred in
- * \param text      a name or label for the MPI being output. Normally the
- *                  variable name
- * \param X         the MPI variable
- *
- * \attention       This function is intended for INTERNAL usage within the
- *                  library only.
- */
-void mbedtls_debug_print_mpi(const mbedtls_ssl_context *ssl, int level,
-                             const char *file, int line,
-                             const char *text, const mbedtls_mpi *X);
-#endif
-
-#if defined(MBEDTLS_ECP_LIGHT)
-/**
- * \brief   Print an ECP point to the debug output. This function is always
- *          used through the MBEDTLS_SSL_DEBUG_ECP() macro, which supplies the
- *          ssl context, file and line number parameters.
- *
- * \param ssl       SSL context
- * \param level     error level of the debug message
- * \param file      file the error has occurred in
- * \param line      line number the error has occurred in
- * \param text      a name or label for the ECP point being output. Normally the
- *                  variable name
- * \param X         the ECP point
- *
- * \attention       This function is intended for INTERNAL usage within the
- *                  library only.
- */
-void mbedtls_debug_print_ecp(const mbedtls_ssl_context *ssl, int level,
-                             const char *file, int line,
-                             const char *text, const mbedtls_ecp_point *X);
-#endif
-
-#if defined(MBEDTLS_X509_CRT_PARSE_C) && !defined(MBEDTLS_X509_REMOVE_INFO)
-/**
- * \brief   Print a X.509 certificate structure to the debug output. This
- *          function is always used through the MBEDTLS_SSL_DEBUG_CRT() macro,
- *          which supplies the ssl context, file and line number parameters.
- *
- * \param ssl       SSL context
- * \param level     error level of the debug message
- * \param file      file the error has occurred in
- * \param line      line number the error has occurred in
- * \param text      a name or label for the certificate being output
- * \param crt       X.509 certificate structure
- *
- * \attention       This function is intended for INTERNAL usage within the
- *                  library only.
- */
-void mbedtls_debug_print_crt(const mbedtls_ssl_context *ssl, int level,
-                             const char *file, int line,
-                             const char *text, const mbedtls_x509_crt *crt);
-#endif
-
-/* Note: the MBEDTLS_ECDH_C guard here is mandatory because this debug function
-         only works for the built-in implementation. */
-#if defined(MBEDTLS_KEY_EXCHANGE_SOME_ECDH_OR_ECDHE_ANY_ENABLED) && \
-    defined(MBEDTLS_ECDH_C)
-typedef enum {
-    MBEDTLS_DEBUG_ECDH_Q,
-    MBEDTLS_DEBUG_ECDH_QP,
-    MBEDTLS_DEBUG_ECDH_Z,
-} mbedtls_debug_ecdh_attr;
-
-/**
- * \brief   Print a field of the ECDH structure in the SSL context to the debug
- *          output. This function is always used through the
- *          MBEDTLS_SSL_DEBUG_ECDH() macro, which supplies the ssl context, file
- *          and line number parameters.
- *
- * \param ssl       SSL context
- * \param level     error level of the debug message
- * \param file      file the error has occurred in
- * \param line      line number the error has occurred in
- * \param ecdh      the ECDH context
- * \param attr      the identifier of the attribute being output
- *
- * \attention       This function is intended for INTERNAL usage within the
- *                  library only.
- */
-void mbedtls_debug_printf_ecdh(const mbedtls_ssl_context *ssl, int level,
-                               const char *file, int line,
-                               const mbedtls_ecdh_context *ecdh,
-                               mbedtls_debug_ecdh_attr attr);
-#endif /* MBEDTLS_KEY_EXCHANGE_SOME_ECDH_OR_ECDHE_ANY_ENABLED &&
-          MBEDTLS_ECDH_C */
-
 #ifdef __cplusplus
 }
 #endif
 
-#endif /* debug.h */
+#endif /* MBEDTLS_DEBUG_H */
diff --git a/library/debug.c b/library/debug.c
index a9d58e5..c36ed3c 100644
--- a/library/debug.c
+++ b/library/debug.c
@@ -11,7 +11,7 @@
 
 #include "mbedtls/platform.h"
 
-#include "mbedtls/debug.h"
+#include "debug_internal.h"
 #include "mbedtls/error.h"
 
 #include <stdarg.h>
diff --git a/library/debug_internal.h b/library/debug_internal.h
new file mode 100644
index 0000000..4523b46
--- /dev/null
+++ b/library/debug_internal.h
@@ -0,0 +1,172 @@
+/**
+ * \file debug_internal.h
+ *
+ * \brief Internal part of the public "debug.h".
+ */
+/*
+ *  Copyright The Mbed TLS Contributors
+ *  SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
+ */
+#ifndef MBEDTLS_DEBUG_INTERNAL_H
+#define MBEDTLS_DEBUG_INTERNAL_H
+
+#include "mbedtls/debug.h"
+
+/**
+ * \brief    Print a message to the debug output. This function is always used
+ *          through the MBEDTLS_SSL_DEBUG_MSG() macro, which supplies the ssl
+ *          context, file and line number parameters.
+ *
+ * \param ssl       SSL context
+ * \param level     error level of the debug message
+ * \param file      file the message has occurred in
+ * \param line      line number the message has occurred at
+ * \param format    format specifier, in printf format
+ * \param ...       variables used by the format specifier
+ *
+ * \attention       This function is intended for INTERNAL usage within the
+ *                  library only.
+ */
+void mbedtls_debug_print_msg(const mbedtls_ssl_context *ssl, int level,
+                             const char *file, int line,
+                             const char *format, ...) MBEDTLS_PRINTF_ATTRIBUTE(5, 6);
+
+/**
+ * \brief   Print the return value of a function to the debug output. This
+ *          function is always used through the MBEDTLS_SSL_DEBUG_RET() macro,
+ *          which supplies the ssl context, file and line number parameters.
+ *
+ * \param ssl       SSL context
+ * \param level     error level of the debug message
+ * \param file      file the error has occurred in
+ * \param line      line number the error has occurred in
+ * \param text      the name of the function that returned the error
+ * \param ret       the return code value
+ *
+ * \attention       This function is intended for INTERNAL usage within the
+ *                  library only.
+ */
+void mbedtls_debug_print_ret(const mbedtls_ssl_context *ssl, int level,
+                             const char *file, int line,
+                             const char *text, int ret);
+
+/**
+ * \brief   Output a buffer of size len bytes to the debug output. This function
+ *          is always used through the MBEDTLS_SSL_DEBUG_BUF() macro,
+ *          which supplies the ssl context, file and line number parameters.
+ *
+ * \param ssl       SSL context
+ * \param level     error level of the debug message
+ * \param file      file the error has occurred in
+ * \param line      line number the error has occurred in
+ * \param text      a name or label for the buffer being dumped. Normally the
+ *                  variable or buffer name
+ * \param buf       the buffer to be outputted
+ * \param len       length of the buffer
+ *
+ * \attention       This function is intended for INTERNAL usage within the
+ *                  library only.
+ */
+void mbedtls_debug_print_buf(const mbedtls_ssl_context *ssl, int level,
+                             const char *file, int line, const char *text,
+                             const unsigned char *buf, size_t len);
+
+#if defined(MBEDTLS_BIGNUM_C)
+/**
+ * \brief   Print a MPI variable to the debug output. This function is always
+ *          used through the MBEDTLS_SSL_DEBUG_MPI() macro, which supplies the
+ *          ssl context, file and line number parameters.
+ *
+ * \param ssl       SSL context
+ * \param level     error level of the debug message
+ * \param file      file the error has occurred in
+ * \param line      line number the error has occurred in
+ * \param text      a name or label for the MPI being output. Normally the
+ *                  variable name
+ * \param X         the MPI variable
+ *
+ * \attention       This function is intended for INTERNAL usage within the
+ *                  library only.
+ */
+void mbedtls_debug_print_mpi(const mbedtls_ssl_context *ssl, int level,
+                             const char *file, int line,
+                             const char *text, const mbedtls_mpi *X);
+#endif
+
+#if defined(MBEDTLS_ECP_LIGHT)
+/**
+ * \brief   Print an ECP point to the debug output. This function is always
+ *          used through the MBEDTLS_SSL_DEBUG_ECP() macro, which supplies the
+ *          ssl context, file and line number parameters.
+ *
+ * \param ssl       SSL context
+ * \param level     error level of the debug message
+ * \param file      file the error has occurred in
+ * \param line      line number the error has occurred in
+ * \param text      a name or label for the ECP point being output. Normally the
+ *                  variable name
+ * \param X         the ECP point
+ *
+ * \attention       This function is intended for INTERNAL usage within the
+ *                  library only.
+ */
+void mbedtls_debug_print_ecp(const mbedtls_ssl_context *ssl, int level,
+                             const char *file, int line,
+                             const char *text, const mbedtls_ecp_point *X);
+#endif
+
+#if defined(MBEDTLS_X509_CRT_PARSE_C) && !defined(MBEDTLS_X509_REMOVE_INFO)
+/**
+ * \brief   Print a X.509 certificate structure to the debug output. This
+ *          function is always used through the MBEDTLS_SSL_DEBUG_CRT() macro,
+ *          which supplies the ssl context, file and line number parameters.
+ *
+ * \param ssl       SSL context
+ * \param level     error level of the debug message
+ * \param file      file the error has occurred in
+ * \param line      line number the error has occurred in
+ * \param text      a name or label for the certificate being output
+ * \param crt       X.509 certificate structure
+ *
+ * \attention       This function is intended for INTERNAL usage within the
+ *                  library only.
+ */
+void mbedtls_debug_print_crt(const mbedtls_ssl_context *ssl, int level,
+                             const char *file, int line,
+                             const char *text, const mbedtls_x509_crt *crt);
+#endif
+
+/* Note: the MBEDTLS_ECDH_C guard here is mandatory because this debug function
+         only works for the built-in implementation. */
+#if defined(MBEDTLS_KEY_EXCHANGE_SOME_ECDH_OR_ECDHE_ANY_ENABLED) && \
+    defined(MBEDTLS_ECDH_C)
+typedef enum {
+    MBEDTLS_DEBUG_ECDH_Q,
+    MBEDTLS_DEBUG_ECDH_QP,
+    MBEDTLS_DEBUG_ECDH_Z,
+} mbedtls_debug_ecdh_attr;
+
+/**
+ * \brief   Print a field of the ECDH structure in the SSL context to the debug
+ *          output. This function is always used through the
+ *          MBEDTLS_SSL_DEBUG_ECDH() macro, which supplies the ssl context, file
+ *          and line number parameters.
+ *
+ * \param ssl       SSL context
+ * \param level     error level of the debug message
+ * \param file      file the error has occurred in
+ * \param line      line number the error has occurred in
+ * \param ecdh      the ECDH context
+ * \param attr      the identifier of the attribute being output
+ *
+ * \attention       This function is intended for INTERNAL usage within the
+ *                  library only.
+ */
+void mbedtls_debug_printf_ecdh(const mbedtls_ssl_context *ssl, int level,
+                               const char *file, int line,
+                               const mbedtls_ecdh_context *ecdh,
+                               mbedtls_debug_ecdh_attr attr);
+#endif /* MBEDTLS_KEY_EXCHANGE_SOME_ECDH_OR_ECDHE_ANY_ENABLED &&
+          MBEDTLS_ECDH_C */
+
+#endif /* MBEDTLS_DEBUG_INTERNAL_H */
diff --git a/library/ssl_client.c b/library/ssl_client.c
index d585ca5..6d988a8 100644
--- a/library/ssl_client.c
+++ b/library/ssl_client.c
@@ -12,7 +12,7 @@
 
 #include <string.h>
 
-#include "mbedtls/debug.h"
+#include "debug_internal.h"
 #include "mbedtls/error.h"
 #include "mbedtls/platform.h"
 
diff --git a/library/ssl_msg.c b/library/ssl_msg.c
index 6579c96..5753cf9 100644
--- a/library/ssl_msg.c
+++ b/library/ssl_msg.c
@@ -18,7 +18,7 @@
 
 #include "mbedtls/ssl.h"
 #include "ssl_misc.h"
-#include "mbedtls/debug.h"
+#include "debug_internal.h"
 #include "mbedtls/error.h"
 #include "mbedtls/platform_util.h"
 #include "mbedtls/version.h"
diff --git a/library/ssl_tls.c b/library/ssl_tls.c
index 8c1e372..bd1380a 100644
--- a/library/ssl_tls.c
+++ b/library/ssl_tls.c
@@ -20,7 +20,7 @@
 #include "ssl_debug_helpers.h"
 #include "ssl_misc.h"
 
-#include "mbedtls/debug.h"
+#include "debug_internal.h"
 #include "mbedtls/error.h"
 #include "mbedtls/platform_util.h"
 #include "mbedtls/version.h"
diff --git a/library/ssl_tls12_client.c b/library/ssl_tls12_client.c
index 0c5af87..c3a8037 100644
--- a/library/ssl_tls12_client.c
+++ b/library/ssl_tls12_client.c
@@ -14,7 +14,7 @@
 #include "mbedtls/ssl.h"
 #include "ssl_client.h"
 #include "ssl_misc.h"
-#include "mbedtls/debug.h"
+#include "debug_internal.h"
 #include "mbedtls/error.h"
 #include "mbedtls/constant_time.h"
 
diff --git a/library/ssl_tls12_server.c b/library/ssl_tls12_server.c
index 5a9f6ca..f242faa 100644
--- a/library/ssl_tls12_server.c
+++ b/library/ssl_tls12_server.c
@@ -13,7 +13,7 @@
 
 #include "mbedtls/ssl.h"
 #include "ssl_misc.h"
-#include "mbedtls/debug.h"
+#include "debug_internal.h"
 #include "mbedtls/error.h"
 #include "mbedtls/platform_util.h"
 #include "constant_time_internal.h"
diff --git a/library/ssl_tls13_client.c b/library/ssl_tls13_client.c
index 5c668bd..86dd0ec 100644
--- a/library/ssl_tls13_client.c
+++ b/library/ssl_tls13_client.c
@@ -11,7 +11,7 @@
 
 #include <string.h>
 
-#include "mbedtls/debug.h"
+#include "debug_internal.h"
 #include "mbedtls/error.h"
 #include "mbedtls/platform.h"
 
diff --git a/library/ssl_tls13_generic.c b/library/ssl_tls13_generic.c
index 47fa65c..202631f 100644
--- a/library/ssl_tls13_generic.c
+++ b/library/ssl_tls13_generic.c
@@ -12,7 +12,7 @@
 #include <string.h>
 
 #include "mbedtls/error.h"
-#include "mbedtls/debug.h"
+#include "debug_internal.h"
 #include "mbedtls/oid.h"
 #include "mbedtls/platform.h"
 #include "mbedtls/constant_time.h"
diff --git a/library/ssl_tls13_keys.c b/library/ssl_tls13_keys.c
index 9b775ec..d79e70c 100644
--- a/library/ssl_tls13_keys.c
+++ b/library/ssl_tls13_keys.c
@@ -13,7 +13,7 @@
 #include <string.h>
 
 #include "mbedtls/hkdf.h"
-#include "mbedtls/debug.h"
+#include "debug_internal.h"
 #include "mbedtls/error.h"
 #include "mbedtls/platform.h"
 
diff --git a/library/ssl_tls13_server.c b/library/ssl_tls13_server.c
index 6e2866a..29c9f6c 100644
--- a/library/ssl_tls13_server.c
+++ b/library/ssl_tls13_server.c
@@ -9,7 +9,7 @@
 
 #if defined(MBEDTLS_SSL_SRV_C) && defined(MBEDTLS_SSL_PROTO_TLS1_3)
 
-#include "mbedtls/debug.h"
+#include "debug_internal.h"
 #include "mbedtls/error.h"
 #include "mbedtls/platform.h"
 #include "mbedtls/constant_time.h"
diff --git a/tests/suites/test_suite_debug.function b/tests/suites/test_suite_debug.function
index b961040..eeefc95 100644
--- a/tests/suites/test_suite_debug.function
+++ b/tests/suites/test_suite_debug.function
@@ -1,5 +1,5 @@
 /* BEGIN_HEADER */
-#include "mbedtls/debug.h"
+#include "debug_internal.h"
 #include "string.h"
 #include "mbedtls/pk.h"