diff --git a/modules/mixins/common/default.nix b/modules/mixins/common/default.nix
index 407c327b..3c9a4f9f 100644
--- a/modules/mixins/common/default.nix
+++ b/modules/mixins/common/default.nix
@@ -52,6 +52,8 @@
   ];
 
   home-manager = {
+    backupFileExtension = "backup";
+
     extraSpecialArgs = {
       inherit
         hostname