diff --git a/library/md4.c b/library/md4.c
index 2b5fcff..a1c8244 100644
--- a/library/md4.c
+++ b/library/md4.c
@@ -290,7 +290,7 @@
     md4_starts( &ctx );
 
     while( ( n = fread( buf, 1, sizeof( buf ), f ) ) > 0 )
-        md4_update( &ctx, buf, (int) n );
+        md4_update( &ctx, buf, n );
 
     md4_finish( &ctx, output );