diff --git a/pkgs/by-name/ch/chez-matchable/package.nix b/pkgs/by-name/ch/chez-matchable/package.nix
index 1b595f432ce5..86c3095fe375 100644
--- a/pkgs/by-name/ch/chez-matchable/package.nix
+++ b/pkgs/by-name/ch/chez-matchable/package.nix
@@ -7,12 +7,13 @@
 
 stdenv.mkDerivation rec {
   pname = "chez-matchable";
+  # nixpkgs-update: no auto update
   version = "0.2";
 
   src = fetchFromGitHub {
     owner = "fedeinthemix";
     repo = "chez-matchable";
-    rev = "v${version}";
+    tag = "v${version}";
     sha256 = "sha256-UYoT8Kp1FTfiL22ntrFXFcAB1HGVrJ6p9JgvhUKi+Yo=";
   };