--- a/eric6/Project/ProjectInterfacesBrowser.py	Tue Jan 05 15:14:40 2021 +0100
+++ b/eric6/Project/ProjectInterfacesBrowser.py	Tue Jan 05 18:28:31 2021 +0100
@@ -29,6 +29,7 @@
     BrowserClassAttributeItem
 )
 import UI.PixmapCache
+from UI.NotificationWidget import NotificationTypes
 
 import Preferences
 import Utilities
@@ -536,6 +537,7 @@
                 self.tr("Interface Compilation"),
                 self.tr(
                     "The compilation of the interface file failed."),
+                kind=NotificationTypes.Critical,
                 timeout=0)
         self.compileProc = None