diff --git a/pkgs/by-name/co/cocom-tool-set/package.nix b/pkgs/by-name/co/cocom-tool-set/package.nix
index f4d2b2358d43..9ab545e01c4f 100644
--- a/pkgs/by-name/co/cocom-tool-set/package.nix
+++ b/pkgs/by-name/co/cocom-tool-set/package.nix
@@ -19,6 +19,7 @@ stdenv.mkDerivation (finalAttrs: {
     NIX_CFLAGS_COMPILE = toString [
       "-Wno-error=implicit-int"
       "-Wno-error=implicit-function-declaration"
+      "-std=gnu17"
     ];
   };