diff --git a/library/ccm.c b/library/ccm.c
index a7a2cc4..cf65209 100644
--- a/library/ccm.c
+++ b/library/ccm.c
@@ -37,7 +37,7 @@
 #if defined(MBEDTLS_CCM_C)
 
 #include "mbedtls/ccm.h"
-#include "mbedtls/utils.h"
+#include "mbedtls/platform_util.h"
 
 #include <string.h>
 
@@ -98,7 +98,7 @@
 void mbedtls_ccm_free( mbedtls_ccm_context *ctx )
 {
     mbedtls_cipher_free( &ctx->cipher_ctx );
-    mbedtls_zeroize( ctx, sizeof( mbedtls_ccm_context ) );
+    mbedtls_platform_zeroize( ctx, sizeof( mbedtls_ccm_context ) );
 }
 
 /*
@@ -339,7 +339,7 @@
 
     if( diff != 0 )
     {
-        mbedtls_zeroize( output, length );
+        mbedtls_platform_zeroize( output, length );
         return( MBEDTLS_ERR_CCM_AUTH_FAILED );
     }