diff --git a/qframelesswindow/titlebar/__init__.py b/qframelesswindow/titlebar/__init__.py
index ed559f0..3a8146a 100644
--- a/qframelesswindow/titlebar/__init__.py
+++ b/qframelesswindow/titlebar/__init__.py
@@ -80,7 +80,7 @@ def _isDragRegion(self, pos):
             if button.isVisible():
                 width += button.width()
 
-        return 0 < pos.x() < self.width() - width
+        return self.window().BORDER_WIDTH < pos.x() < self.width() - width and pos.y() > self.window().BORDER_WIDTH
 
     def _hasButtonPressed(self):
         """ whether any button is pressed """