diff --git a/src/Gui/NotificationArea.cpp b/src/Gui/NotificationArea.cpp
index 93fbe07fd2..a93afef6a1 100644
--- a/src/Gui/NotificationArea.cpp
+++ b/src/Gui/NotificationArea.cpp
@@ -996,9 +996,9 @@ void NotificationArea::showInNotificationArea()
                                   getMainWindow(),
                                   pImp->notificationExpirationTime,
                                   pImp->minimumOnScreenTime,
-                                  NotificationBox::OnlyIfReferenceActive |
-                                  NotificationBox::RestrictAreaToReference |
-                                  NotificationBox::HideIfReferenceWidgetDeactivated,
+                                  NotificationBox::Options::OnlyIfReferenceActive |
+                                  NotificationBox::Options::RestrictAreaToReference |
+                                  NotificationBox::Options::HideIfReferenceWidgetDeactivated,
                                   pImp->notificationWidth);
     }
 }
diff --git a/src/Gui/NotificationBox.h b/src/Gui/NotificationBox.h
index 323f7ad448..c34483d675 100644
--- a/src/Gui/NotificationBox.h
+++ b/src/Gui/NotificationBox.h
@@ -49,7 +49,7 @@ class NotificationBox
     NotificationBox() = delete;
 
 public:
-     enum Options {
+     enum class Options {
          None = 0x0,
          RestrictAreaToReference = 0x1,
          OnlyIfReferenceActive = 0x2,
@@ -100,6 +100,12 @@ inline NotificationBox::Options operator|(NotificationBox::Options lhs, Notifica
         static_cast<std::underlying_type<NotificationBox::Options>::type>(rhs));
 }
 
+inline bool operator&(NotificationBox::Options lhs, NotificationBox::Options rhs) {
+    return (
+        static_cast<std::underlying_type<NotificationBox::Options>::type>(lhs) &
+        static_cast<std::underlying_type<NotificationBox::Options>::type>(rhs));
+}
+
 }// namespace Gui
 
 #endif// GUI_NOTIFICATIONBOX_H