diff --git a/pkgs/development/compilers/cc65/default.nix b/pkgs/development/compilers/cc65/default.nix
index 347382990d16..6e201ac79339 100644
--- a/pkgs/development/compilers/cc65/default.nix
+++ b/pkgs/development/compilers/cc65/default.nix
@@ -53,5 +53,6 @@ stdenv.mkDerivation rec {
     '';
     license = licenses.zlib;
     maintainers = with maintainers; [ AndersonTorres ];
+    platforms = with platforms; unix;
   };
 }