diff --git a/expression/integration_test.go b/expression/integration_test.go
index 2fa88c03c8668..27936818eb1d4 100644
--- a/expression/integration_test.go
+++ b/expression/integration_test.go
@@ -6284,7 +6284,11 @@ func (s *testIntegrationSerialSuite) TestCollationBasic(c *C) {
 	tk.MustExec("drop table if exists t")
 	tk.MustExec("create table t(c set('A', 'B') collate utf8mb4_general_ci);")
 	tk.MustExec("insert into t values('a');")
-	tk.MustQuery("select c from t1  where c = 'a';").Check(testkit.Rows("A"))
+	tk.MustExec("insert into t values('B');")
+	tk.MustQuery("select c from t where c = 'a';").Check(testkit.Rows("A"))
+	tk.MustQuery("select c from t where c = 'A';").Check(testkit.Rows("A"))
+	tk.MustQuery("select c from t where c = 'b';").Check(testkit.Rows("B"))
+	tk.MustQuery("select c from t where c = 'B';").Check(testkit.Rows("B"))
 }
 
 func (s *testIntegrationSerialSuite) TestWeightString(c *C) {