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-rw-r--r--scripts/qapi/expr.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/scripts/qapi/expr.py b/scripts/qapi/expr.py
index f3a4a8536e..396c8126d6 100644
--- a/scripts/qapi/expr.py
+++ b/scripts/qapi/expr.py
@@ -102,7 +102,7 @@ def check_keys(value, info, source, required, optional):
             "%s misses key%s %s"
             % (source, 's' if len(missing) > 1 else '',
                pprint(missing)))
-    allowed = set(required + optional)
+    allowed = set(required) | set(optional)
     unknown = set(value) - allowed
     if unknown:
         raise QAPISemError(