diff --git a/dm/config/security/security.go b/dm/config/security/security.go
index 4ec521d23eb..84143fab0ae 100644
--- a/dm/config/security/security.go
+++ b/dm/config/security/security.go
@@ -103,15 +103,15 @@ func (s *Security) Clone() *Security {
 	return &clone
 }
 
-func (s *Security) WriteFiles(name string) error {
+func (s *Security) WriteFiles(fileName string) error {
 	var err error
-	if s.SSLCA, err = certificate.WriteFile(fmt.Sprintf("%s_ca.pem", name), s.SSLCABytes); err != nil {
+	if s.SSLCA, err = certificate.WriteFile(fileName, s.SSLCABytes); err != nil {
 		return err
 	}
-	if s.SSLCert, err = certificate.WriteFile(fmt.Sprintf("%s_dm.pem", name), s.SSLCertBytes); err != nil {
+	if s.SSLCert, err = certificate.WriteFile(fileName, s.SSLCertBytes); err != nil {
 		return err
 	}
-	if s.SSLKey, err = certificate.WriteFile(fmt.Sprintf("%s_dm.key", name), s.SSLKeyBytes); err != nil {
+	if s.SSLKey, err = certificate.WriteFile(fileName, s.SSLKeyBytes); err != nil {
 		return err
 	}
 	return nil