diff --git a/contrib/mailman b/contrib/mailman
index 45b7db36..85ab8005 100644
--- a/contrib/mailman
+++ b/contrib/mailman
@@ -5,7 +5,7 @@
 
 _mailman_lists()
 {
-	COMPREPLY=( $( list_lists -b | grep "^$cur") )
+	COMPREPLY=( $( compgen -W '$( list_lists -b )' -- $cur ) )
 }
 
 _add_members()