diff --git a/mkurllist b/mkurllist
index 309fb68..6ca3f0b 100755
--- a/mkurllist
+++ b/mkurllist
@@ -74,6 +74,7 @@ cd $tmp
     extractlog
     extractbin
   }
+  [ "$1" = 'check' ] && rdupes
   cd $dir
   sort urllist > final
   mv final urllist