diff --git a/layout/generic/nsObjectFrame.cpp b/layout/generic/nsObjectFrame.cpp
index e4ad6487203..afa2d22c988 100644
--- a/layout/generic/nsObjectFrame.cpp
+++ b/layout/generic/nsObjectFrame.cpp
@@ -1344,7 +1344,9 @@ nsObjectFrame::HandleEvent(nsIPresContext* aPresContext,
 	case NS_MOUSE_MOVE:
 	case NS_MOUSE_ENTER:
 	case NS_MOUSE_LEFT_BUTTON_UP:
+#ifndef XP_MAC
 	case NS_MOUSE_LEFT_BUTTON_DOWN:
+#endif
 		*anEventStatus = mInstanceOwner->ProcessEvent(*anEvent);
 		break;
 		
diff --git a/layout/html/base/src/nsObjectFrame.cpp b/layout/html/base/src/nsObjectFrame.cpp
index e4ad6487203..afa2d22c988 100644
--- a/layout/html/base/src/nsObjectFrame.cpp
+++ b/layout/html/base/src/nsObjectFrame.cpp
@@ -1344,7 +1344,9 @@ nsObjectFrame::HandleEvent(nsIPresContext* aPresContext,
 	case NS_MOUSE_MOVE:
 	case NS_MOUSE_ENTER:
 	case NS_MOUSE_LEFT_BUTTON_UP:
+#ifndef XP_MAC
 	case NS_MOUSE_LEFT_BUTTON_DOWN:
+#endif
 		*anEventStatus = mInstanceOwner->ProcessEvent(*anEvent);
 		break;