diff --git a/pkgs/tools/networking/vpnc/default.nix b/pkgs/tools/networking/vpnc/default.nix
index ed61c5ade91..4fbb26eba21 100644
--- a/pkgs/tools/networking/vpnc/default.nix
+++ b/pkgs/tools/networking/vpnc/default.nix
@@ -31,6 +31,8 @@ stdenv.mkDerivation {
     patchShebangs src/makeman.pl
   '';
 
+  enableParallelBuilding = true;
+
   meta = with lib; {
     homepage = "https://davidepucci.it/doc/vpnc/";
     description = "Virtual private network (VPN) client for Cisco's VPN concentrators";