diff --git a/library/pem.c b/library/pem.c
index 897c8a0..4b99664 100644
--- a/library/pem.c
+++ b/library/pem.c
@@ -273,7 +273,7 @@
 
     enc = 0;
 
-    if( s2 - s1 >= 22 && memcmp( s1, "Proc-Type: 4,ENCRYPTED", 22 ) == 0 )
+    if( s2 - s1 >= 22 && mbedtls_platform_memcmp( s1, "Proc-Type: 4,ENCRYPTED", 22 ) == 0 )
     {
 #if defined(MBEDTLS_MD5_C) && defined(MBEDTLS_CIPHER_MODE_CBC) &&         \
     ( defined(MBEDTLS_DES_C) || defined(MBEDTLS_AES_C) )
@@ -286,7 +286,7 @@
 
 
 #if defined(MBEDTLS_DES_C)
-        if( s2 - s1 >= 23 && memcmp( s1, "DEK-Info: DES-EDE3-CBC,", 23 ) == 0 )
+        if( s2 - s1 >= 23 && mbedtls_platform_memcmp( s1, "DEK-Info: DES-EDE3-CBC,", 23 ) == 0 )
         {
             enc_alg = MBEDTLS_CIPHER_DES_EDE3_CBC;
 
@@ -296,7 +296,7 @@
 
             s1 += 16;
         }
-        else if( s2 - s1 >= 18 && memcmp( s1, "DEK-Info: DES-CBC,", 18 ) == 0 )
+        else if( s2 - s1 >= 18 && mbedtls_platform_memcmp( s1, "DEK-Info: DES-CBC,", 18 ) == 0 )
         {
             enc_alg = MBEDTLS_CIPHER_DES_CBC;
 
@@ -309,15 +309,15 @@
 #endif /* MBEDTLS_DES_C */
 
 #if defined(MBEDTLS_AES_C)
-        if( s2 - s1 >= 14 && memcmp( s1, "DEK-Info: AES-", 14 ) == 0 )
+        if( s2 - s1 >= 14 && mbedtls_platform_memcmp( s1, "DEK-Info: AES-", 14 ) == 0 )
         {
             if( s2 - s1 < 22 )
                 return( MBEDTLS_ERR_PEM_UNKNOWN_ENC_ALG );
-            else if( memcmp( s1, "DEK-Info: AES-128-CBC,", 22 ) == 0 )
+            else if( mbedtls_platform_memcmp( s1, "DEK-Info: AES-128-CBC,", 22 ) == 0 )
                 enc_alg = MBEDTLS_CIPHER_AES_128_CBC;
-            else if( memcmp( s1, "DEK-Info: AES-192-CBC,", 22 ) == 0 )
+            else if( mbedtls_platform_memcmp( s1, "DEK-Info: AES-192-CBC,", 22 ) == 0 )
                 enc_alg = MBEDTLS_CIPHER_AES_192_CBC;
-            else if( memcmp( s1, "DEK-Info: AES-256-CBC,", 22 ) == 0 )
+            else if( mbedtls_platform_memcmp( s1, "DEK-Info: AES-256-CBC,", 22 ) == 0 )
                 enc_alg = MBEDTLS_CIPHER_AES_256_CBC;
             else
                 return( MBEDTLS_ERR_PEM_UNKNOWN_ENC_ALG );