diff --git a/library/sha1.c b/library/sha1.c
index a7577b4..1587de4 100644
--- a/library/sha1.c
+++ b/library/sha1.c
@@ -33,7 +33,7 @@
 #if defined(MBEDTLS_SHA1_C)
 
 #include "mbedtls/sha1.h"
-#include "mbedtls/utils.h"
+#include "mbedtls/platform_util.h"
 
 #include <string.h>
 
@@ -81,7 +81,7 @@
     if( ctx == NULL )
         return;
 
-    mbedtls_zeroize( ctx, sizeof( mbedtls_sha1_context ) );
+    mbedtls_platform_zeroize( ctx, sizeof( mbedtls_sha1_context ) );
 }
 
 void mbedtls_sha1_clone( mbedtls_sha1_context *dst,