diff --git a/library/md5.c b/library/md5.c
index a7faa8d..1c5b397 100644
--- a/library/md5.c
+++ b/library/md5.c
@@ -309,7 +309,7 @@
     md5_starts( &ctx );
 
     while( ( n = fread( buf, 1, sizeof( buf ), f ) ) > 0 )
-        md5_update( &ctx, buf, (int) n );
+        md5_update( &ctx, buf, n );
 
     md5_finish( &ctx, output );