diff --git a/libavformat/cache.c b/libavformat/cache.c
index f6787ee6cf..02b02bbf54 100644
--- a/libavformat/cache.c
+++ b/libavformat/cache.c
@@ -145,8 +145,8 @@ static int add_entry(URLContext *h, const unsigned char *buf, int size)
 
     return 0;
 fail:
-    if (pos >= 0)
-        ftruncate(c->fd, pos);
+    //we could truncate the file to pos here if pos >=0 but ftruncate isnt available in VS so
+    //for simplicty we just leave the file a bit larger
     av_free(entry);
     av_free(node);
     return ret;