diff --git a/widget/src/mac/nsMacWindow.cpp b/widget/src/mac/nsMacWindow.cpp
index 2c8d9e5d75b..adfa548ba8d 100644
--- a/widget/src/mac/nsMacWindow.cpp
+++ b/widget/src/mac/nsMacWindow.cpp
@@ -616,7 +616,10 @@ nsresult nsMacWindow::StandardCreate(nsIWidget *aParent,
          mWindowType != eWindowType_java) {
       const EventTypeSpec kScrollEventList[] = {
         { kEventClassMouse, kEventMouseWheelMoved },
+#if 0
+        // Disabled due to bug 347626
         { kEventClassMouse, kEventMouseScroll },
+#endif
       };
 
       static EventHandlerUPP sScrollEventHandlerUPP;