diff --git a/nixos/system/home/shared.nix b/nixos/system/home/shared.nix
index 956eaa2..83db851 100644
--- a/nixos/system/home/shared.nix
+++ b/nixos/system/home/shared.nix
@@ -57,7 +57,6 @@ in {
 
   programs = {
     home-manager.enable = true;
-    home-manager.backupFileExtension = "backup";
     nix-index.enable = true;
     nix-index.enableZshIntegration = true;
     nix-index-database.comma.enable = true;
diff --git a/nixos/system/users.nix b/nixos/system/users.nix
index a6f56ca..1ecd6d6 100644
--- a/nixos/system/users.nix
+++ b/nixos/system/users.nix
@@ -71,4 +71,5 @@ in {
 
   users.users = rootUser.users.users // ironmagmaUser.users.users // {};
   home-manager.users = rootUser.home-manager.users;
+  home-manager.backupFileExtension = "backup";
 }