diff --git a/handler/duck/duck_handler.go b/handler/duck/duck_handler.go
index decb618..3ccf555 100644
--- a/handler/duck/duck_handler.go
+++ b/handler/duck/duck_handler.go
@@ -51,6 +51,7 @@ func (handler *Handler) DomainLoop(domain *godns.Domain, panicChan chan<- godns.
 		if currentIP == lastIP {
 			log.Printf("IP is the same as cached one. Skip update.\n")
 		} else {
+			lastIP = currentIP
 			client := &http.Client{}
 
 			if handler.Configuration.Socks5Proxy != "" {