diff --git a/pkgs/applications/networking/browsers/firefox/17.0.nix b/pkgs/applications/networking/browsers/firefox/17.0.nix
index 30cd54b9d43..14a5db5cc2e 100644
--- a/pkgs/applications/networking/browsers/firefox/17.0.nix
+++ b/pkgs/applications/networking/browsers/firefox/17.0.nix
@@ -70,7 +70,7 @@ rec {
         "--disable-javaxpcom"
       ] ++ commonConfigureFlags;
 
-    enableParallelBuilding = true;
+    enableParallelBuilding = false;
 
     preConfigure =
       ''
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index e3c5e17f22c..4cec21d85fd 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -2894,6 +2894,7 @@ let
 
   xulrunner = pkgs.firefoxPkgs.xulrunner;
 
+
   ### DEVELOPMENT / MISC
 
   avrgcclibc = callPackage ../development/misc/avr-gcc-with-avr-libc {};