diff --git a/tests/pytest/query/queryTbnameUpperLower.py b/tests/pytest/query/queryTbnameUpperLower.py
index 147ec04793c3708258fc08bfadc8c12637a3df80..ec30f1089052ff8f1102aa0df03dcd57e4833697 100644
--- a/tests/pytest/query/queryTbnameUpperLower.py
+++ b/tests/pytest/query/queryTbnameUpperLower.py
@@ -26,6 +26,8 @@ class TDTestCase:
         '''
         tdCom.cleanTb()
         table_name = tdCom.getLongName(8, "letters_mixed")
+        while table_name.islower():
+            table_name = tdCom.getLongName(8, "letters_mixed")
         table_name_sub = f'{table_name}_sub'
         tb_name_lower = table_name_sub.lower()
         tb_name_upper = table_name_sub.upper()