diff --git a/pkgs/development/python-modules/testresources/default.nix b/pkgs/development/python-modules/testresources/default.nix
index fa4fc0b1fed..ce00b17b177 100644
--- a/pkgs/development/python-modules/testresources/default.nix
+++ b/pkgs/development/python-modules/testresources/default.nix
@@ -10,7 +10,7 @@ buildPythonPackage rec {
     sha256 = "ee9d1982154a1e212d4e4bac6b610800bfb558e4fb853572a827bc14a96e4417";
   };
 
-  buildInputs = [ pbr ];
+  propagatedBuildInputs = [ pbr ];
 
   checkInputs = [ fixtures testtools ];