diff --git a/client/client.go b/client/client.go
index baebb3a..cb69dfd 100644
--- a/client/client.go
+++ b/client/client.go
@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"log"
 	"net"
+	"reflect"
 	"runtime"
 	"sync"
 	"sync/atomic"
@@ -297,9 +298,11 @@ func (c *client) rpcReader(readerDone chan<- error) {
 
 func (c *client) responseHandle(codecResponse protocol.ClientCodecResponse) error {
 	c.pendingRequestsLock.Lock()
-	cs, ok := c.pendingRequests[codecResponse.ID().(uint64)]
+	id := reflect.ValueOf(codecResponse.ID()).Convert(uint64Type).Uint()
+
+	cs, ok := c.pendingRequests[id]
 	if ok {
-		delete(c.pendingRequests, codecResponse.ID().(uint64))
+		delete(c.pendingRequests, id)
 	}
 	c.pendingRequestsLock.Unlock()
 
diff --git a/client/constants.go b/client/constants.go
index a741697..0f266e5 100644
--- a/client/constants.go
+++ b/client/constants.go
@@ -1,6 +1,9 @@
 package client
 
-import "time"
+import (
+	"reflect"
+	"time"
+)
 
 const (
 	// DefaultRequestTimeout is the default timeout for client request.
@@ -10,3 +13,5 @@ const (
 	// handled by Client and Server.
 	DefaultPendingMessages = 32 * 1024
 )
+
+var uint64Type = reflect.TypeOf(uint64(0))