diff --git a/libraries/entropy/server/interfaces/mirrors.py b/libraries/entropy/server/interfaces/mirrors.py
index d33c66a40..16742146e 100644
--- a/libraries/entropy/server/interfaces/mirrors.py
+++ b/libraries/entropy/server/interfaces/mirrors.py
@@ -1295,7 +1295,7 @@ class Server(ServerNoticeBoardMixin):
                 header = brown("    # ")
             )
             return
-        sorter = lambda x, y, z: y
+        sorter = lambda (x, y, z): y
         for s_repo, s_name, s_sets in sorted(sets_data, key = sorter):
             self._entropy.output(
                 blue("%s" % (s_name,)),