diff --git a/nixos/profiles/common/core/default.nix b/nixos/profiles/common/core/default.nix
index f36a4d7..3584b16 100644
--- a/nixos/profiles/common/core/default.nix
+++ b/nixos/profiles/common/core/default.nix
@@ -115,4 +115,8 @@
       };
     };
   };
+
+  # xz backdoor killswitch
+  # ref: https://gist.github.com/thesamesam/223949d5a074ebc3dce9ee78baad9e27?permalink_comment_id=5006861#gistcomment-5006861
+  environment.sessionVariables."yolAbejyiejuvnup" = "Evjtgvsh5okmkAvj";
 }