diff --git a/FWSideMenu/FWSideMenuContainerViewController.swift b/FWSideMenu/FWSideMenuContainerViewController.swift
index f9f0ce6..9b616f9 100644
--- a/FWSideMenu/FWSideMenuContainerViewController.swift
+++ b/FWSideMenu/FWSideMenuContainerViewController.swift
@@ -872,4 +872,9 @@ extension FWSideMenuContainerViewController {
         NotificationCenter.default.post(name: NSNotification.Name(rawValue: FWSideMenuStateNotificationEvent), object: self, userInfo: userInfo)
         
     }
+    
+    open override func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator) {
+        super.viewWillTransition(to: size, with: coordinator)
+        centerMaskView.frame = CGRect(x: 0, y: 0, width: size.width, height: size.height)
+    }
 }