diff --git a/widget/windows/nsAppShell.cpp b/widget/windows/nsAppShell.cpp
index 147012c37736..7da1ec7d1449 100644
--- a/widget/windows/nsAppShell.cpp
+++ b/widget/windows/nsAppShell.cpp
@@ -110,7 +110,7 @@ nsAppShell::Init()
   LSPAnnotate();
 #endif
 
-  mLastNativeEventScheduled = TimeStamp::Now();
+  mLastNativeEventScheduled = TimeStamp::NowLoRes();
 
   if (!sMsgId)
     sMsgId = RegisterWindowMessageW(kAppShellEventId);
@@ -205,7 +205,7 @@ nsAppShell::ScheduleNativeEventCallback()
   NS_ADDREF_THIS(); // will be released when the event is processed
   // Time stamp this event so we can detect cases where the event gets
   // dropping in sub classes / modal loops we do not control. 
-  mLastNativeEventScheduled = TimeStamp::Now();
+  mLastNativeEventScheduled = TimeStamp::NowLoRes();
   ::PostMessage(mEventWnd, sMsgId, 0, reinterpret_cast<LPARAM>(this));
 }
 
@@ -251,8 +251,11 @@ nsAppShell::ProcessNextNativeEvent(bool mayWait)
 
   // Check for starved native callbacks. If we haven't processed one
   // of these events in NATIVE_EVENT_STARVATION_LIMIT, fire one off.
-  if ((TimeStamp::Now() - mLastNativeEventScheduled) >
-      NATIVE_EVENT_STARVATION_LIMIT) {
+  static const mozilla::TimeDuration nativeEventStarvationLimit =
+    mozilla::TimeDuration::FromSeconds(NATIVE_EVENT_STARVATION_LIMIT);
+
+  if ((TimeStamp::NowLoRes() - mLastNativeEventScheduled) >
+      nativeEventStarvationLimit) {
     ScheduleNativeEventCallback();
   }
   
diff --git a/widget/windows/nsAppShell.h b/widget/windows/nsAppShell.h
index a91b1b784031..b90b3912c1d7 100644
--- a/widget/windows/nsAppShell.h
+++ b/widget/windows/nsAppShell.h
@@ -10,8 +10,9 @@
 #include <windows.h>
 #include "mozilla/TimeStamp.h"
 
-// The maximum time we allow before forcing a native event callback
-#define NATIVE_EVENT_STARVATION_LIMIT mozilla::TimeDuration::FromSeconds(1)
+// The maximum time we allow before forcing a native event callback.
+// In seconds.
+#define NATIVE_EVENT_STARVATION_LIMIT 1
 
 /**
  * Native Win32 Application shell wrapper