diff --git a/scripts/qapi/expr.py b/scripts/qapi/expr.py
index 48578e1698..5a1782b57e 100644
--- a/scripts/qapi/expr.py
+++ b/scripts/qapi/expr.py
@@ -443,7 +443,7 @@ def check_features(features: Optional[object],
         check_keys(feat, info, source, ['name'], ['if'])
         check_name_is_str(feat['name'], info, source)
         source = "%s '%s'" % (source, feat['name'])
-        check_name_str(feat['name'], info, source)
+        check_name_lower(feat['name'], info, source)
         check_if(feat, info, source)