diff --git a/common/types.go b/common/types.go
index 4f7f74a..4be83a3 100644
--- a/common/types.go
+++ b/common/types.go
@@ -197,6 +197,9 @@ func checkConfig() string {
 func WaitDBUp() {
 	sdb, err := dtmimp.StandaloneDB(DtmConfig.DB)
 	dtmimp.FatalIfError(err)
+	defer func() {
+		sdb.Close()
+	}()
 	for _, err := dtmimp.DBExec(sdb, "select 1"); err != nil; { // wait for mysql to start
 		time.Sleep(3 * time.Second)
 		_, err = dtmimp.DBExec(sdb, "select 1")
diff --git a/common/types_test.go b/common/types_test.go
index 84d4c32..ed3c30f 100644
--- a/common/types_test.go
+++ b/common/types_test.go
@@ -19,6 +19,10 @@ func TestDb(t *testing.T) {
 	assert.NotEqual(t, nil, err)
 }
 
+func TestWaitDBUp(t *testing.T) {
+	WaitDBUp()
+}
+
 func TestDbAlone(t *testing.T) {
 	db, err := dtmimp.StandaloneDB(DtmConfig.DB)
 	assert.Nil(t, err)