diff --git a/python/pyplugin_installer/installer.py b/python/pyplugin_installer/installer.py
index 804166fa9c6..66a444f2a39 100644
--- a/python/pyplugin_installer/installer.py
+++ b/python/pyplugin_installer/installer.py
@@ -700,7 +700,7 @@ class QgsPluginInstaller(QObject):
         else:
             msg = "<b>%s:</b> %s" % (self.tr("Plugin installation failed"), infoString)
 
-        level = Qgis.Success if success else Qgis.Critical
+        level = Qgis.MessageLevel.Success if success else Qgis.MessageLevel.Critical
         iface.pluginManagerInterface().pushMessage(msg, level)
 
     def processDependencies(self, plugin_id):