diff --git a/pkgs/applications/science/misc/root/default.nix b/pkgs/applications/science/misc/root/default.nix
index 6f484dc8224..f4de3ba6eea 100644
--- a/pkgs/applications/science/misc/root/default.nix
+++ b/pkgs/applications/science/misc/root/default.nix
@@ -17,6 +17,8 @@ stdenv.mkDerivation rec {
   patches = [ ./cmake.patch ];
   patchFlags = "-p0";
 
+  enableParallelBuilding = true;
+
   meta = {
     homepage = "http://root.cern.ch/drupal/";
     description = "A data analysis framework";