diff --git a/pkgs/games/warzone2100/default.nix b/pkgs/games/warzone2100/default.nix
index be2525c98716..7e6b8986109e 100644
--- a/pkgs/games/warzone2100/default.nix
+++ b/pkgs/games/warzone2100/default.nix
@@ -44,12 +44,12 @@ let
   };
 in
 
-stdenv.mkDerivation rec {
+stdenv.mkDerivation (finalAttrs: {
   inherit pname;
   version  = "4.4.2";
 
   src = fetchurl {
-    url = "mirror://sourceforge/project/warzone2100/releases/${version}/warzone2100_src.tar.xz";
+    url = "mirror://sourceforge/project/warzone2100/releases/${finalAttrs.version}/warzone2100_src.tar.xz";
     hash = "sha256-O5Yqxqp1vKYr8uvAZ1SdsI/kocOzg0KRCirCqqvLrN4=";
   };
 
@@ -142,4 +142,4 @@ stdenv.mkDerivation rec {
     # https://github.com/Warzone2100/warzone2100/blob/master/macosx/README.md
     broken = stdenv.isDarwin;
   };
-}
+})