diff --git a/firefox-mozconfig b/firefox-mozconfig
index 3a43e31..8278b5e 100644
--- a/firefox-mozconfig
+++ b/firefox-mozconfig
@@ -21,6 +21,7 @@ ac_add_options --enable-svg
 ac_add_options --enable-canvas
 ac_add_options --enable-startup-notification
 ac_add_options --enable-libxul
+ac_add_options --with-system-libxul
 ac_add_options --disable-crashreporter
 ac_add_options --enable-safe-browsing
 ac_add_options --enable-libnotify