diff --git a/pkgs/applications/networking/mumble/default.nix b/pkgs/applications/networking/mumble/default.nix
index a0eb459369df..12c250ab28bb 100644
--- a/pkgs/applications/networking/mumble/default.nix
+++ b/pkgs/applications/networking/mumble/default.nix
@@ -54,6 +54,8 @@ let
       cp man/mum* $out/share/man/man1
     '' + (overrides.installPhase or "");
 
+    enableParallelBuilding = true;
+
     meta = {
       description = "Low-latency, high quality voice chat software";
       homepage = "http://mumble.sourceforge.net/";