diff --git a/python/servo/post_build_commands.py b/python/servo/post_build_commands.py
index c1c3f73dc69..c9891cd7986 100644
--- a/python/servo/post_build_commands.py
+++ b/python/servo/post_build_commands.py
@@ -132,6 +132,7 @@ class PostBuildCommands(CommandBase):
                 return 1
             args = args + ['-w', '-b', '--pref', 'dom.mozbrowser.enabled',
                            path.join(browserhtml_path, 'out', 'index.html')]
+            args = args + params
         else:
             args = args + params