diff --git a/pkgs/applications/science/misc/openmodelica/default.nix b/pkgs/applications/science/misc/openmodelica/default.nix
index 8b413f20b1e9..fd39f61c8633 100644
--- a/pkgs/applications/science/misc/openmodelica/default.nix
+++ b/pkgs/applications/science/misc/openmodelica/default.nix
@@ -22,6 +22,8 @@ stdenv.mkDerivation {
 
   hardeningDisable = [ "format" ];
 
+  enableParallelBuilding = true;
+
   patchPhase = ''
     cp -fv ${fakegit}/bin/checkout-git.sh libraries/checkout-git.sh
     cp -fv ${fakegit}/bin/checkout-svn.sh libraries/checkout-svn.sh