diff --git a/script.coffee b/script.coffee
index a1410fa38..6791e8584 100644
--- a/script.coffee
+++ b/script.coffee
@@ -372,26 +372,25 @@ $.extend $,
     return
   open: (url) ->
     (GM_openInTab or window.open) url, '_blank'
-  queueTask:
+  queueTask: (->
     # inspired by https://www.w3.org/Bugs/Public/show_bug.cgi?id=15007
-    (->
-      taskQueue = []
-      execTask = ->
-        task = taskQueue.shift()
-        func = task[0]
-        args = Array::slice.call task, 1
-        func.apply func, args
-      if window.MessageChannel
-        taskChannel = new MessageChannel()
-        taskChannel.port1.onmessage = execTask
-        ->
-          taskQueue.push arguments
-          taskChannel.port2.postMessage null
-      else # XXX Firefox
-        ->
-          taskQueue.push arguments
-          setTimeout execTask, 0
-    )()
+    taskQueue = []
+    execTask = ->
+      task = taskQueue.shift()
+      func = task[0]
+      args = Array::slice.call task, 1
+      func.apply func, args
+    if window.MessageChannel
+      taskChannel = new MessageChannel()
+      taskChannel.port1.onmessage = execTask
+      ->
+        taskQueue.push arguments
+        taskChannel.port2.postMessage null
+    else # XXX Firefox
+      ->
+        taskQueue.push arguments
+        setTimeout execTask, 0
+  )()
   globalEval: (code) ->
     script = $.el 'script',
       textContent: code