diff --git a/home-manager-modules/git/default.nix b/home-manager-modules/git/default.nix
index 9c167cb..1d5b9e6 100644
--- a/home-manager-modules/git/default.nix
+++ b/home-manager-modules/git/default.nix
@@ -13,6 +13,10 @@ with lib;
       enable = true;
       userName = "Julien Malka";
       userEmail = "julien.malka@me.com";
+      signing = {
+        signByDefault = true;
+        key = "D00126C95ACC7547BDE2DC523C68E13964FEA07F";
+      };
     };
   };
 }