diff --git a/pkgs/tools/misc/cht.sh/default.nix b/pkgs/tools/misc/cht.sh/default.nix
index b34b1ee4d517..f61defdbdeda 100644
--- a/pkgs/tools/misc/cht.sh/default.nix
+++ b/pkgs/tools/misc/cht.sh/default.nix
@@ -10,7 +10,7 @@
 
 stdenv.mkDerivation {
   pname = "cht.sh";
-  version = "unstable-2022-04-18";
+  version = "0-unstable-2022-04-18";
 
   nativeBuildInputs = [ makeWrapper ];