diff --git a/src/osx/cocoa/window.mm b/src/osx/cocoa/window.mm
index 166388bf58..07cdeee8a0 100644
--- a/src/osx/cocoa/window.mm
+++ b/src/osx/cocoa/window.mm
@@ -1149,8 +1149,8 @@ void wxWidgetCocoaImpl::mouseEvent(WX_NSEvent event, WXWidget slf, void *_cmd)
             superimpl(slf, (SEL)_cmd, event);
             
             // super of built-ins keeps the mouse up, as wx expects this event, we have to synthesize it
-            
-            if ( [ event type]  == NSLeftMouseDown )
+            // only trigger if at this moment the mouse is already up
+            if ( [ event type]  == NSLeftMouseDown && !( [NSEvent pressedMouseButtons] & 0x01) )
             {
                 wxMouseEvent wxevent(wxEVT_LEFT_DOWN);
                 SetupMouseEvent(wxevent , event) ;