diff --git a/nixos/system/home/shared.nix b/nixos/system/home/shared.nix
index 83db851..956eaa2 100644
--- a/nixos/system/home/shared.nix
+++ b/nixos/system/home/shared.nix
@@ -57,6 +57,7 @@ in {
 
   programs = {
     home-manager.enable = true;
+    home-manager.backupFileExtension = "backup";
     nix-index.enable = true;
     nix-index.enableZshIntegration = true;
     nix-index-database.comma.enable = true;