diff --git a/modules/global/home-manager.nix b/modules/global/home-manager.nix
index e5b9d9e..e1d2af2 100644
--- a/modules/global/home-manager.nix
+++ b/modules/global/home-manager.nix
@@ -2,6 +2,7 @@
   home-manager = {
     useUserPackages = lib.mkDefault true;
     useGlobalPkgs = true;
+    backupFileExtension = "old";
 
     extraSpecialArgs = {
       main = config;