diff --git a/tests/modules/programs/emacs/extra-config.nix b/tests/modules/programs/emacs/extra-config.nix
index 52e83de5c..86259877b 100644
--- a/tests/modules/programs/emacs/extra-config.nix
+++ b/tests/modules/programs/emacs/extra-config.nix
@@ -16,6 +16,7 @@ let
   mkTestPackage = epkgs:
     epkgs.trivialBuild {
       pname = "hm-test";
+      version = "0.1.0";
       src = pkgs.writeText "hm-test.el" ''
         (defun hm-test-fn () 'success)
         (provide 'hm-test)