diff --git a/pkgs/development/compilers/cc65/default.nix b/pkgs/development/compilers/cc65/default.nix
index 502cecfa8cf..cb2410ba06a 100644
--- a/pkgs/development/compilers/cc65/default.nix
+++ b/pkgs/development/compilers/cc65/default.nix
@@ -13,6 +13,8 @@ gccStdenv.mkDerivation rec {
 
   makeFlags = [ "PREFIX=${placeholder "out"}" ];
 
+  enableParallelBuilding = true;
+
   meta = with lib; {
     homepage = "https://cc65.github.io/";
     description = "C compiler for processors of 6502 family";