diff --git a/pkgs/by-name/xs/xskat/package.nix b/pkgs/by-name/xs/xskat/package.nix
index 4aadc81e238e..280ec9da3db3 100644
--- a/pkgs/by-name/xs/xskat/package.nix
+++ b/pkgs/by-name/xs/xskat/package.nix
@@ -22,7 +22,7 @@ stdenv.mkDerivation (finalAttrs: {
     sha256 = "8ba52797ccbd131dce69b96288f525b0d55dee5de4008733f7a5a51deb831c10";
   };
 
-  env.NIX_CFLAGS_COMPILE = "-Wno-implicit-int";
+  env.NIX_CFLAGS_COMPILE = "-std=gnu17 -Wno-implicit-int";
 
   preInstall = ''
     sed -i Makefile \