diff --git a/scripts/qapi/schema.py b/scripts/qapi/schema.py
index 087c6e9366..173e27d9e2 100644
--- a/scripts/qapi/schema.py
+++ b/scripts/qapi/schema.py
@@ -751,6 +751,7 @@ def describe(self, info):
             else:
                 assert False
 
+        assert info is not None
         if defined_in != info.defn_name:
             return "%s '%s' of %s '%s'" % (role, self.name, meta, defined_in)
         return "%s '%s'" % (role, self.name)
@@ -841,6 +842,7 @@ def __init__(self, name, info, doc, ifcond, features,
         self.coroutine = coroutine
 
     def check(self, schema):
+        assert self.info is not None
         super().check(schema)
         if self._arg_type_name:
             arg_type = schema.resolve_type(