diff --git a/pkgs/by-name/ka/kakasi/package.nix b/pkgs/by-name/ka/kakasi/package.nix
index 7064324c6a85..f607dd1d74b2 100644
--- a/pkgs/by-name/ka/kakasi/package.nix
+++ b/pkgs/by-name/ka/kakasi/package.nix
@@ -39,6 +39,10 @@ stdenv.mkDerivation rec {
     ./gettext-0.25.patch
   ];
 
+  env = lib.optionalAttrs (!stdenv.cc.isClang) {
+    NIX_CFLAGS_COMPILE = "-std=gnu17";
+  };
+
   postPatch = ''
     for a in tests/kakasi-* ; do
       substituteInPlace $a \