diff --git a/tests/system-test/2-query/cast.py b/tests/system-test/2-query/cast.py
index adcd52b598..ea6d8c1a8a 100644
--- a/tests/system-test/2-query/cast.py
+++ b/tests/system-test/2-query/cast.py
@@ -677,6 +677,8 @@ class TDTestCase:
         tdDnodes.stop(1)
         tdDnodes.start(1)
 
+        tdSql.execute("use db")
+
         self.all_test()
 
     def stop(self):