diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index d4c7f8894b18..641616352f8b 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -13217,7 +13217,7 @@ let
     # XXX: skipping two tests fails in python2.6
     doCheck = ! isPy26;
 
-    buildInputs = optionals isPy26 [ self.ordereddict unittest2 ];
+    buildInputs = with self; optionals isPy26 [ ordereddict unittest2 ];
 
     propagatedBuildInputs = with self; [
       nose