diff --git a/examples/esp8266/WebSocketClientSocketIO/WebSocketClientSocketIO.ino b/examples/esp8266/WebSocketClientSocketIO/WebSocketClientSocketIO.ino
index 06f7616..26574ca 100644
--- a/examples/esp8266/WebSocketClientSocketIO/WebSocketClientSocketIO.ino
+++ b/examples/esp8266/WebSocketClientSocketIO/WebSocketClientSocketIO.ino
@@ -29,6 +29,9 @@ void socketIOEvent(socketIOmessageType_t type, uint8_t * payload, size_t length)
             break;
         case sIOtype_CONNECT:
             USE_SERIAL.printf("[IOc] Connected to url: %s\n", payload);
+
+            // join default namespace (no auto join in Socket.IO V3)
+            socketIO.send(sIOtype_CONNECT, "/");
             break;
         case sIOtype_EVENT:
             USE_SERIAL.printf("[IOc] get event: %s\n", payload);
diff --git a/examples/esp8266/WebSocketClientSocketIOack/WebSocketClientSocketIOack.ino b/examples/esp8266/WebSocketClientSocketIOack/WebSocketClientSocketIOack.ino
index f0f8991..ab9ff68 100644
--- a/examples/esp8266/WebSocketClientSocketIOack/WebSocketClientSocketIOack.ino
+++ b/examples/esp8266/WebSocketClientSocketIOack/WebSocketClientSocketIOack.ino
@@ -30,6 +30,9 @@ void socketIOEvent(socketIOmessageType_t type, uint8_t * payload, size_t length)
             break;
         case sIOtype_CONNECT:
             USE_SERIAL.printf("[IOc] Connected to url: %s\n", payload);
+
+            // join default namespace (no auto join in Socket.IO V3)
+            socketIO.send(sIOtype_CONNECT, "/");
             break;
         case sIOtype_EVENT:
         {