diff --git a/nautilus/mat2.py b/nautilus/mat2.py
index 990a45926f19a8751e8d8c47ab9b5ec8a888b39e..9ed6c2d276bdd5b57221fef155dab37cfa889a7e 100644
--- a/nautilus/mat2.py
+++ b/nautilus/mat2.py
@@ -231,7 +231,7 @@ class Mat2Extension(GObject.GObject, Nautilus.MenuProvider, Nautilus.LocationWid
         """
         # Do not show the menu item if not a single file has a chance to be
         # processed by mat2.
-        if not any([is_valid for (is_valid, _) in map(self.__validate, files)]):
+        if not any((is_valid for (is_valid, _) in map(self.__validate, files))):
             return None
 
         item = Nautilus.MenuItem(