diff --git a/intern/ghost/intern/GHOST_SystemCarbon.cpp b/intern/ghost/intern/GHOST_SystemCarbon.cpp
index 1d1181a4f2f..1b44a83d3fa 100644
--- a/intern/ghost/intern/GHOST_SystemCarbon.cpp
+++ b/intern/ghost/intern/GHOST_SystemCarbon.cpp
@@ -629,7 +629,6 @@ bool GHOST_SystemCarbon::handleMouseDown(EventRef event)
 	
 	part = ::FindWindow(mousePos, &window);
 	ghostWindow = (GHOST_IWindow*) ::GetWRefCon(window);
-	GHOST_ASSERT(validWindow(ghostWindow), "GHOST_SystemCarbon::handleMouseEvent: invalid window");
 	
 	switch (part) {
 		case inMenuBar: