diff --git a/library/ripemd160.c b/library/ripemd160.c
index bdfad2c..3ef8e10 100644
--- a/library/ripemd160.c
+++ b/library/ripemd160.c
@@ -520,7 +520,7 @@
     int i, ret = 0;
     unsigned char output[20];
 
-    mbedtls_platform_memset( output, 0, sizeof output );
+    memset( output, 0, sizeof output );
 
     for( i = 0; i < TESTS; i++ )
     {