diff --git a/modules/programs/git.nix b/modules/programs/git.nix
index 672bd799..de5d9cd8 100644
--- a/modules/programs/git.nix
+++ b/modules/programs/git.nix
@@ -71,7 +71,7 @@ in
 
       extraConfig = mkOption {
         type = types.lines;
-        default = null;
+        default = "";
         description = "Additional configuration to add.";
       };
     };