diff --git a/yocto-poky/bitbake/lib/bb/command.py b/yocto-poky/bitbake/lib/bb/command.py
index 74106d1..0559ffc 100644
--- a/yocto-poky/bitbake/lib/bb/command.py
+++ b/yocto-poky/bitbake/lib/bb/command.py
@@ -279,6 +279,7 @@
         mask = params[3]
         return bb.event.set_UIHmask(handlerNum, llevel, debug_domains, mask)
     setEventMask.needconfig = False
+    setEventMask.readonly = True
 
     def setFeatures(self, command, params):
         """