diff --git a/executor/explain_test.go b/executor/explain_test.go
index 86db5d6ea4e03..8a274ecd7604a 100644
--- a/executor/explain_test.go
+++ b/executor/explain_test.go
@@ -160,7 +160,9 @@ func (s *testSuite1) TestMemoryUsageAfterClose(c *C) {
 	tk := testkit.NewTestKitWithInit(c, s.store)
 	tk.MustExec("drop table if exists t")
 	tk.MustExec("create table t (v int, k int, key(k))")
-	tk.MustExec("insert into t values (1, 1), (1, 1), (1, 1), (1, 1), (1, 1)")
+	for i := 0; i < tk.Se.GetSessionVars().MaxChunkSize*5; i++ {
+		tk.MustExec(fmt.Sprintf("insert into t values (%v, %v)", i, i))
+	}
 	SQLs := []string{"select v+abs(k) from t"}
 	for _, sql := range SQLs {
 		tk.MustQuery(sql)