diff --git a/library/gcm.c b/library/gcm.c
index 39e8dd3..57b0279 100644
--- a/library/gcm.c
+++ b/library/gcm.c
@@ -38,7 +38,7 @@
 #if defined(MBEDTLS_GCM_C)
 
 #include "mbedtls/gcm.h"
-#include "mbedtls/utils.h"
+#include "mbedtls/platform_util.h"
 
 #include <string.h>
 
@@ -494,7 +494,7 @@
 
     if( diff != 0 )
     {
-        mbedtls_zeroize( output, length );
+        mbedtls_platform_zeroize( output, length );
         return( MBEDTLS_ERR_GCM_AUTH_FAILED );
     }
 
@@ -504,7 +504,7 @@
 void mbedtls_gcm_free( mbedtls_gcm_context *ctx )
 {
     mbedtls_cipher_free( &ctx->cipher_ctx );
-    mbedtls_zeroize( ctx, sizeof( mbedtls_gcm_context ) );
+    mbedtls_platform_zeroize( ctx, sizeof( mbedtls_gcm_context ) );
 }
 
 #endif /* !MBEDTLS_GCM_ALT */