diff --git a/master.cfg b/master.cfg
index b705d90..0685fcf 100644
--- a/master.cfg
+++ b/master.cfg
@@ -1249,7 +1249,7 @@ class GDB_Try_Jobdir (Try_Jobdir):
         ret = Try_Jobdir.parseJob (self, f)
         root_msgid = "<%s-%s-try@gdb-build>" % (ret['baserev'],
                                                 strftime ("%H-%M-%S"))
-        ret['root_message_id'] = root_msgid
+        ret['properties']['root_message_id'] = root_msgid
         return ret
 
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