1 files changed, 2 insertions, 0 deletions
diff --git a/scripts/qapi.py b/scripts/qapi.py
index 023930ea0c..d0e793452a 100644
--- a/scripts/qapi.py
+++ b/scripts/qapi.py
@@ -116,6 +116,8 @@ class QAPISchema:
             if self.tok != ':':
                 raise QAPISchemaError(self, 'Expected ":"')
             self.accept()
+            if key in expr:
+                raise QAPISchemaError(self, 'Duplicate key "%s"' % key)
             expr[key] = self.get_expr(True)
             if self.tok == '}':
                 self.accept()