diff --git a/modules/programs/git.nix b/modules/programs/git.nix
index 6de8e812d901..e5470ca3e7a8 100644
--- a/modules/programs/git.nix
+++ b/modules/programs/git.nix
@@ -508,7 +508,7 @@ in {
           commit.gpgSign = mkDefault cfg.signing.signByDefault;
           tag.gpgSign = mkDefault cfg.signing.signByDefault;
           gpg = {
-            inherit format;
+            format = mkDefault format;
             ${format}.program = cfg.signing.signer;
           };
         };