diff --git a/dom/base/nsGlobalWindow.cpp b/dom/base/nsGlobalWindow.cpp
index dec4ced43269..7c21a5bb9ce9 100644
--- a/dom/base/nsGlobalWindow.cpp
+++ b/dom/base/nsGlobalWindow.cpp
@@ -9400,9 +9400,7 @@ nsGlobalWindow::SetTimeoutOrInterval(nsIScriptTimeoutHandler *aHandler,
 
     nsRefPtr<nsTimeout> copy = timeout;
 
-    rv = timeout->mTimer->InitWithFuncCallback(TimerCallback, timeout,
-                                               realInterval,
-                                               nsITimer::TYPE_ONE_SHOT);
+    rv = timeout->InitTimer(TimerCallback, realInterval);
     if (NS_FAILED(rv)) {
       return rv;
     }
@@ -9637,10 +9635,7 @@ nsGlobalWindow::RescheduleTimeout(nsTimeout* aTimeout, const TimeStamp& now,
   // platforms whether delay is positive or negative (which we
   // know is always positive here, but cast anyways for
   // consistency).
-  nsresult rv = aTimeout->mTimer->
-    InitWithFuncCallback(TimerCallback, aTimeout,
-                         delay.ToMilliseconds(),
-                         nsITimer::TYPE_ONE_SHOT);
+  nsresult rv = aTimeout->InitTimer(TimerCallback, delay.ToMilliseconds());
 
   if (NS_FAILED(rv)) {
     NS_ERROR("Error initializing timer for DOM timeout!");
@@ -9982,11 +9977,7 @@ nsresult nsGlobalWindow::ResetTimersForNonBackgroundWindow()
       timeout->mFiringDepth = firingDepth;
       timeout->Release();
 
-      nsresult rv =
-        timeout->mTimer->InitWithFuncCallback(TimerCallback,
-                                              timeout,
-                                              delay.ToMilliseconds(),
-                                              nsITimer::TYPE_ONE_SHOT);
+      nsresult rv = timeout->InitTimer(TimerCallback, delay.ToMilliseconds());
 
       if (NS_FAILED(rv)) {
         NS_WARNING("Error resetting non background timer for DOM timeout!");
@@ -10499,8 +10490,7 @@ nsGlobalWindow::ResumeTimeouts(bool aThawChildren)
       t->mTimer = do_CreateInstance("@mozilla.org/timer;1");
       NS_ENSURE_TRUE(t->mTimer, NS_ERROR_OUT_OF_MEMORY);
 
-      rv = t->mTimer->InitWithFuncCallback(TimerCallback, t, delay,
-                                           nsITimer::TYPE_ONE_SHOT);
+      rv = t->InitTimer(TimerCallback, delay);
       if (NS_FAILED(rv)) {
         t->mTimer = nsnull;
         return rv;
diff --git a/dom/base/nsGlobalWindow.h b/dom/base/nsGlobalWindow.h
index b9187df6db9e..8583a780feb7 100644
--- a/dom/base/nsGlobalWindow.h
+++ b/dom/base/nsGlobalWindow.h
@@ -153,6 +153,11 @@ struct nsTimeout : PRCList
     return static_cast<nsTimeout*>(PR_PREV_LINK(this));
   }
 
+  nsresult InitTimer(nsTimerCallbackFunc aFunc, PRUint64 delay) {
+    return mTimer->InitWithFuncCallback(aFunc, this, delay,
+                                        nsITimer::TYPE_ONE_SHOT);
+  }
+
   // Window for which this timeout fires
   nsRefPtr<nsGlobalWindow> mWindow;