diff --git a/src/SocketIOclient.h b/src/SocketIOclient.h
index a71afed..2eccea3 100644
--- a/src/SocketIOclient.h
+++ b/src/SocketIOclient.h
@@ -9,6 +9,7 @@
 #define SOCKETIOCLIENT_H_
 
 #include "WebSockets.h"
+#include "WebSocketsClient.h"
 
 #define EIO_HEARTBEAT_INTERVAL 20000