diff --git a/pkgs/games/xskat/default.nix b/pkgs/games/xskat/default.nix
index 6f28a6846ea7..993070c89c96 100644
--- a/pkgs/games/xskat/default.nix
+++ b/pkgs/games/xskat/default.nix
@@ -12,6 +12,8 @@ stdenv.mkDerivation rec {
     sha256 = "8ba52797ccbd131dce69b96288f525b0d55dee5de4008733f7a5a51deb831c10";
   };
 
+  env.NIX_CFLAGS_COMPILE = "-Wno-implicit-int";
+
   preInstall = ''
     sed -i Makefile \
       -e "s|.* BINDIR .*|   BINDIR = $out/bin|" \