diff --git a/modules/programs/git.nix b/modules/programs/git.nix
index fa652258..ee598065 100644
--- a/modules/programs/git.nix
+++ b/modules/programs/git.nix
@@ -496,7 +496,7 @@ in {
           format = if (versionOlder config.home.stateVersion "25.05") then
             (mkOptionDefault "openpgp")
           else
-            null;
+            (mkOptionDefault null);
           signer = let
             defaultSigners = {
               openpgp = getExe config.programs.gpg.package;