diff --git a/pkgs/games/cataclysm-dda/git.nix b/pkgs/games/cataclysm-dda/git.nix
index 1113fe116dc..36f37f7aeba 100644
--- a/pkgs/games/cataclysm-dda/git.nix
+++ b/pkgs/games/cataclysm-dda/git.nix
@@ -2,6 +2,9 @@
 , tiles ? true, Cocoa
 , debug ? false
 , useXdgDir ? false
+, version ? "2019-11-22"
+, rev ? "a6c8ece992bffeae3788425dd4b3b5871e66a9cd"
+, sha256 ? "0ww2q5gykxm802z1kffmnrfahjlx123j1gfszklpsv0b1fccm1ab"
 }:
 
 let
@@ -11,13 +14,12 @@ let
 
   self = common.overrideAttrs (common: rec {
     pname = common.pname + "-git";
-    version = "2019-11-22";
+    inherit version;
 
     src = fetchFromGitHub {
       owner = "CleverRaven";
       repo = "Cataclysm-DDA";
-      rev = "a6c8ece992bffeae3788425dd4b3b5871e66a9cd";
-      sha256 = "0ww2q5gykxm802z1kffmnrfahjlx123j1gfszklpsv0b1fccm1ab";
+      inherit rev sha256;
     };
 
     makeFlags = common.makeFlags ++ [