diff --git a/common.go b/common.go
index 462ac59261..83d771f951 100644
--- a/common.go
+++ b/common.go
@@ -686,6 +686,7 @@ func (c *Config) Clone() *Config {
 		Max0RTTDataSize:             c.Max0RTTDataSize,
 		AllowShortHeaders:           c.AllowShortHeaders,
 		SessionTicketSealer:         c.SessionTicketSealer,
+		UseDelegatedCredentials:     c.UseDelegatedCredentials,
 		sessionTicketKeys:           sessionTicketKeys,
 		// originalConfig is deliberately not duplicated.
 	}