diff --git a/dom/workers/RuntimeService.cpp b/dom/workers/RuntimeService.cpp
index 221f10c45b9..347a2d45fb7 100644
--- a/dom/workers/RuntimeService.cpp
+++ b/dom/workers/RuntimeService.cpp
@@ -19,6 +19,7 @@
 #include "nsISupportsPriority.h"
 #include "nsITimer.h"
 #include "nsPIDOMWindow.h"
+#include "nsLayoutStatics.h"
 
 #include "jsdbgapi.h"
 #include "mozilla/dom/EventTargetBinding.h"
@@ -1001,6 +1002,7 @@ nsresult
 RuntimeService::Init()
 {
   AssertIsOnMainThread();
+  nsLayoutStatics::AddRef();
 
   mIdleThreadTimer = do_CreateInstance(NS_TIMER_CONTRACTID);
   NS_ENSURE_STATE(mIdleThreadTimer);
@@ -1177,6 +1179,7 @@ RuntimeService::Cleanup()
   }
 
   CleanupOSFileConstants();
+  nsLayoutStatics::Release();
 }
 
 // static