1 files changed, 2 insertions, 0 deletions
diff --git a/scripts/qapi/parser.py b/scripts/qapi/parser.py
index ffdd4298b6..4959630ce6 100644
--- a/scripts/qapi/parser.py
+++ b/scripts/qapi/parser.py
@@ -249,6 +249,8 @@ class QAPISchemaParser:
             raise QAPIParseError(self, "expected string or '}'")
         while True:
             key = self.val
+            assert isinstance(key, str)  # Guaranteed by tok == "'"
+
             self.accept()
             if self.tok != ':':
                 raise QAPIParseError(self, "expected ':'")