diff --git a/lib/tests/maintainer-module.nix b/lib/tests/maintainer-module.nix
index afa12587a98d7d6..143704ba0a59e9d 100644
--- a/lib/tests/maintainer-module.nix
+++ b/lib/tests/maintainer-module.nix
@@ -28,5 +28,9 @@ in {
       });
       default = [];
     };
+    inactivityReason = lib.mkOption {
+      type = types.nullOr types.str;
+      default = null;
+    };
   };
 }