diff --git a/config.go b/config.go
index a85cbd0..bef32e3 100644
--- a/config.go
+++ b/config.go
@@ -297,7 +297,7 @@ func (uc *UpstreamConfig) SetupTransport() {
 
 func (uc *UpstreamConfig) setupDOHTransport() {
 	uc.setupDOHTransportWithoutPingUpstream()
-	uc.pingUpstream()
+	go uc.pingUpstream()
 }
 
 func (uc *UpstreamConfig) newDOHTransport(addrs []string) *http.Transport {
diff --git a/config_quic.go b/config_quic.go
index ad695a8..b6861b6 100644
--- a/config_quic.go
+++ b/config_quic.go
@@ -20,7 +20,7 @@ import (
 
 func (uc *UpstreamConfig) setupDOH3Transport() {
 	uc.setupDOH3TransportWithoutPingUpstream()
-	uc.pingUpstream()
+	go uc.pingUpstream()
 }
 
 func (uc *UpstreamConfig) newDOH3Transport(addrs []string) http.RoundTripper {