diff --git a/system/programs/home-manager.nix b/system/programs/home-manager.nix
index 216ffe2..ace5c17 100644
--- a/system/programs/home-manager.nix
+++ b/system/programs/home-manager.nix
@@ -4,6 +4,7 @@
   ];
 
   home-manager = {
+    backupFileExtension = "backup";
     useGlobalPkgs = true;
     useUserPackages = true;
   };