diff --git a/include/mbedtls/pem.h b/include/mbedtls/pem.h
index 4769bec..9242da6 100644
--- a/include/mbedtls/pem.h
+++ b/include/mbedtls/pem.h
@@ -21,6 +21,7 @@
  */
 #ifndef MBEDTLS_PEM_H
 #define MBEDTLS_PEM_H
+#include "mbedtls/private_access.h"
 
 #if !defined(MBEDTLS_CONFIG_FILE)
 #include "mbedtls/config.h"
@@ -57,9 +58,9 @@
  */
 typedef struct mbedtls_pem_context
 {
-    unsigned char *buf;     /*!< buffer for decoded data             */
-    size_t buflen;          /*!< length of the buffer                */
-    unsigned char *info;    /*!< buffer for extra header information */
+    unsigned char *MBEDTLS_PRIVATE(buf);     /*!< buffer for decoded data             */
+    size_t MBEDTLS_PRIVATE(buflen);          /*!< length of the buffer                */
+    unsigned char *MBEDTLS_PRIVATE(info);    /*!< buffer for extra header information */
 }
 mbedtls_pem_context;