diff --git a/library/sha1.c b/library/sha1.c
index 4032d11..9f0a7b0 100644
--- a/library/sha1.c
+++ b/library/sha1.c
@@ -523,7 +523,7 @@
 
         if( i == 2 )
         {
-            mbedtls_platform_memset( buf, 'a', buflen = 1000 );
+            memset( buf, 'a', buflen = 1000 );
 
             for( j = 0; j < 1000; j++ )
             {