diff --git a/ConnectionState.go b/ConnectionState.go
index d7c0cd1..35e13b1 100644
--- a/ConnectionState.go
+++ b/ConnectionState.go
@@ -25,7 +25,7 @@ func (cs ConnectionState) Format() string {
 	}
 }
 
-func CheckIsNetTimeout(err error) bool {
+func checkIsNetTimeout(err error) bool {
 	if err == nil {
 		return false
 	}
diff --git a/HubConnection.go b/HubConnection.go
index 7459416..dcfe80d 100644
--- a/HubConnection.go
+++ b/HubConnection.go
@@ -324,7 +324,7 @@ func (this *HubConnection) worker() {
 			this.conn.SetReadDeadline(time.Now().Add(SEND_KEEPALIVE_EVERY))
 			nbytes, err = this.conn.Read(readBuff)
 
-			if CheckIsNetTimeout(err) {
+			if checkIsNetTimeout(err) {
 				// No data before read deadline
 				err = nil