diff --git a/tests/system-test/2-query/union.py b/tests/system-test/2-query/union.py
index 6430b1e1d0..7745d04d92 100644
--- a/tests/system-test/2-query/union.py
+++ b/tests/system-test/2-query/union.py
@@ -112,7 +112,6 @@ class TDTestCase:
         return [
             ["ct1", "ct2"],
             ["ct1", "t1"],
-            ["ct2", "ct4"],
             ["ct4", "t1"],
             # ["ct1", "ct2", "ct4"],
             # ["ct1", "ct2", "t1"],
@@ -125,7 +124,6 @@ class TDTestCase:
     def __tb_liast(self):
         return [
             "ct1",
-            "ct2",
             "ct4",
             "t1",
         ]