diff --git a/pkgs/applications/altcoins/bitcoin-classic.nix b/pkgs/applications/altcoins/bitcoin-classic.nix
index 34faf77e980..ad48ea2a625 100644
--- a/pkgs/applications/altcoins/bitcoin-classic.nix
+++ b/pkgs/applications/altcoins/bitcoin-classic.nix
@@ -26,6 +26,8 @@ stdenv.mkDerivation rec {
   configureFlags = [ "--with-boost-libdir=${boost.out}/lib" ]
                      ++ optionals withGui [ "--with-gui=qt5" ];
 
+  enableParallelBuilding = true;
+
   meta = {
     description = "Peer-to-peer electronic cash system (Classic client)";
     longDescription= ''