diff --git a/jedi/mixin/_sre.pym b/jedi/mixin/_sre.pym
index 2b6935b5..00d6c4e0 100644
--- a/jedi/mixin/_sre.pym
+++ b/jedi/mixin/_sre.pym
@@ -22,7 +22,7 @@ def compile():
         def expand(self):
             return ''
 
-        def group(self):
+        def group(self, nr):
             return ''
 
         def groupdict(self):