diff --git a/pkgs/by-name/ms/msnake/package.nix b/pkgs/by-name/ms/msnake/package.nix
index fac1933ab265..d5a3d8a391b0 100644
--- a/pkgs/by-name/ms/msnake/package.nix
+++ b/pkgs/by-name/ms/msnake/package.nix
@@ -19,11 +19,16 @@ stdenv.mkDerivation (finalAttrs: {
   };
 
   postPatch = ''
-    substituteInPlace CMakeLists.txt --replace-fail \
-      "cmake_minimum_required(VERSION 2.8.4)" \
-      "cmake_minimum_required(VERSION 4.0)"
+    substituteInPlace CMakeLists.txt \
+      --replace-fail \
+        "cmake_minimum_required(VERSION 2.8.4)" \
+        "cmake_minimum_required(VERSION 4.0)" \
+      --replace-fail "project(msnake)" "project(msnake C)"
   '';
 
+  # fixes: error: conflicting types for 'display_highscore'
+  env.NIX_CFLAGS_COMPILE = "-std=gnu17";
+
   nativeBuildInputs = [
     cmake
   ];