diff --git a/pkgs/development/compilers/llvm/9/llvm.nix b/pkgs/development/compilers/llvm/9/llvm.nix
index f69f45b858b7e6..0344caa5e8acb0 100644
--- a/pkgs/development/compilers/llvm/9/llvm.nix
+++ b/pkgs/development/compilers/llvm/9/llvm.nix
@@ -160,6 +160,7 @@ in stdenv.mkDerivation (rec {
 
   enableParallelBuilding = true;
 
+  requiredSystemFeatures = [ "big-parallel" ];
   meta = {
     description = "Collection of modular and reusable compiler and toolchain technologies";
     homepage    = "https://llvm.org/";