diff --git a/library/ssl_misc.h b/library/ssl_misc.h
index ce62c2c..e82c625 100644
--- a/library/ssl_misc.h
+++ b/library/ssl_misc.h
@@ -16,6 +16,9 @@
 #include "mbedtls/error.h"
 
 #include "mbedtls/ssl.h"
+#include "mbedtls/debug.h"
+#include "debug_internal.h"
+
 #include "mbedtls/cipher.h"
 
 #include "psa/crypto.h"
@@ -1305,9 +1308,21 @@
 int mbedtls_ssl_handshake_server_step(mbedtls_ssl_context *ssl);
 void mbedtls_ssl_handshake_wrapup(mbedtls_ssl_context *ssl);
 
+#if defined(MBEDTLS_DEBUG_C)
+/* Declared in "ssl_debug_helpers.h". We can't include this file from
+ * "ssl_misc.h" because it includes "ssl_misc.h" because it needs some
+ * type definitions. TODO: split the type definitions and the helper
+ * functions into different headers.
+ */
+const char *mbedtls_ssl_states_str(mbedtls_ssl_states state);
+#endif
+
 static inline void mbedtls_ssl_handshake_set_state(mbedtls_ssl_context *ssl,
                                                    mbedtls_ssl_states state)
 {
+    MBEDTLS_SSL_DEBUG_MSG(3, ("handshake state: %d (%s) -> %d (%s)",
+                              ssl->state, mbedtls_ssl_states_str(ssl->state),
+                              state, mbedtls_ssl_states_str(state)));
     ssl->state = (int) state;
 }