diff --git a/widget/src/build/nsWinWidgetFactory.cpp b/widget/src/build/nsWinWidgetFactory.cpp
index e50a750a11b6..bcf707c39256 100644
--- a/widget/src/build/nsWinWidgetFactory.cpp
+++ b/widget/src/build/nsWinWidgetFactory.cpp
@@ -50,7 +50,6 @@
 #include "nsAppShellSingleton.h"
 #include "nsIServiceManager.h"
 #include "nsSound.h"
-#include "nsIdleServiceWin.h"
 
 #include "nsBidiKeyboard.h"
 
@@ -80,7 +79,6 @@ NS_GENERIC_FACTORY_CONSTRUCTOR(nsFilePicker)
 NS_GENERIC_FACTORY_CONSTRUCTOR(nsSound)
 NS_GENERIC_FACTORY_CONSTRUCTOR(nsDragService)
 NS_GENERIC_FACTORY_CONSTRUCTOR(nsBidiKeyboard)
-NS_GENERIC_FACTORY_CONSTRUCTOR(nsIdleServiceWin)
 #endif
 
 NS_GENERIC_FACTORY_CONSTRUCTOR(nsToolkit)
@@ -130,10 +128,6 @@ static const nsModuleComponentInfo components[] =
     NS_BIDIKEYBOARD_CID,
     "@mozilla.org/widget/bidikeyboard;1",
     nsBidiKeyboardConstructor },
-  { "User Idle Service",
-    NS_IDLE_SERVICE_CID,
-    "@mozilla.org/widget/idleservice;1",
-    nsIdleServiceWinConstructor },
 #endif
   { "Native Theme Renderer", 
     NS_THEMERENDERER_CID,
diff --git a/widget/src/windows/Makefile.in b/widget/src/windows/Makefile.in
index 78ace1195825..c89a5bb50099 100644
--- a/widget/src/windows/Makefile.in
+++ b/widget/src/windows/Makefile.in
@@ -103,7 +103,6 @@ CPPSRCS += \
 	nsImageClipboard.cpp \
 	nsBidiKeyboard.cpp   \
 	nsSound.cpp          \
-	nsIdleServiceWin.cpp    \
 	$(NULL)
 endif
 
diff --git a/widget/src/windows/nsIdleServiceWin.cpp b/widget/src/windows/nsIdleServiceWin.cpp
index b6064ca744ba..2dcb2cb730f8 100644
--- a/widget/src/windows/nsIdleServiceWin.cpp
+++ b/widget/src/windows/nsIdleServiceWin.cpp
@@ -51,7 +51,7 @@ nsIdleServiceWin::GetIdleTime(PRUint32 *aTimeDiff)
     inputInfo.cbSize = sizeof(inputInfo);
     if (!::GetLastInputInfo(&inputInfo))
         return NS_ERROR_FAILURE;
-
+    //XXXgijs: this might break after 49.7 days, see MSDN docs for GetTickCount.
     *aTimeDiff = GetTickCount() - inputInfo.dwTime;
     return NS_OK;
 }