diff --git a/pkgs/development/python-modules/marionette-harness/mozprofile.nix b/pkgs/development/python-modules/marionette-harness/mozprofile.nix
index 9c8e10c7fd01..dda9e07d5e5c 100644
--- a/pkgs/development/python-modules/marionette-harness/mozprofile.nix
+++ b/pkgs/development/python-modules/marionette-harness/mozprofile.nix
@@ -16,7 +16,9 @@ buildPythonPackage rec {
     sha256 = "09l18x72vahq7il9nj6qj7la2d21vvbcn9szlm3vsvsbkz68w0yk";
   };
 
-  propagatedBuildInputs = [ mozlog mozfile mozhttpd wptserve ];
+  propagatedBuildInputs = [ mozlog mozfile mozhttpd ];
+
+  checkInputs = [ wptserve ];
 
   meta = {
     description = "Mozilla application profile handling library";