diff --git a/lib/mock_redis/list_methods.rb b/lib/mock_redis/list_methods.rb
index f677184..57f2347 100644
--- a/lib/mock_redis/list_methods.rb
+++ b/lib/mock_redis/list_methods.rb
@@ -92,7 +92,7 @@ def llen(key)
       with_list_at(key, &:length)
     end
 
-    def lmpop(*args, **options)
+    def lmpop(*keys, **options)
       keys.each do |key|
         assert_listy(key)
       end