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-rw-r--r--scripts/qapi/common.py6
1 files changed, 4 insertions, 2 deletions
diff --git a/scripts/qapi/common.py b/scripts/qapi/common.py
index 88945804dc..9acff01d3e 100644
--- a/scripts/qapi/common.py
+++ b/scripts/qapi/common.py
@@ -897,8 +897,10 @@ def check_union(expr, info):
 
         # The value of member 'discriminator' must name a non-optional
         # member of the base struct.
-        check_name(discriminator, info,
-                   "discriminator of flat union '%s'" % name)
+        check_name_is_str(discriminator, info,
+                          "discriminator of flat union '%s'" % name)
+        check_name_str(discriminator, info,
+                       "discriminator of flat union '%s'" % name)
         discriminator_value = base_members.get(discriminator)
         if not discriminator_value:
             raise QAPISemError(info,