diff --git a/library/md4.c b/library/md4.c
index 828fd42..6a45df6 100644
--- a/library/md4.c
+++ b/library/md4.c
@@ -74,7 +74,7 @@
 
 void mbedtls_md4_init( mbedtls_md4_context *ctx )
 {
-    memset( ctx, 0, sizeof( mbedtls_md4_context ) );
+    mbedtls_platform_memset( ctx, 0, sizeof( mbedtls_md4_context ) );
 }
 
 void mbedtls_md4_free( mbedtls_md4_context *ctx )