diff --git a/library/ripemd160.c b/library/ripemd160.c
index 3a896ae..bdfad2c 100644
--- a/library/ripemd160.c
+++ b/library/ripemd160.c
@@ -340,7 +340,7 @@
 
     if( left && ilen >= fill )
     {
-        memcpy( (void *) (ctx->buffer + left), input, fill );
+        mbedtls_platform_memcpy( (void *) (ctx->buffer + left), input, fill );
 
         if( ( ret = mbedtls_internal_ripemd160_process( ctx, ctx->buffer ) ) != 0 )
             return( ret );
@@ -361,7 +361,7 @@
 
     if( ilen > 0 )
     {
-        memcpy( (void *) (ctx->buffer + left), input, ilen );
+        mbedtls_platform_memcpy( (void *) (ctx->buffer + left), input, ilen );
     }
 
     return( 0 );