diff --git a/src/WebSockets.h b/src/WebSockets.h
index b78199f..22b1e28 100644
--- a/src/WebSockets.h
+++ b/src/WebSockets.h
@@ -52,6 +52,7 @@
 // max size of the WS Message Header
 #define WEBSOCKETS_MAX_HEADER_SIZE  (14)
 
+#if !defined(WEBSOCKETS_NETWORK_TYPE) 
 // select Network type based
 #if defined(ESP8266) || defined(ESP31B)
 #define WEBSOCKETS_NETWORK_TYPE NETWORK_ESP8266
@@ -59,6 +60,7 @@
 #else
 #define WEBSOCKETS_NETWORK_TYPE NETWORK_W5100
 #endif
+#endif
 
 #if (WEBSOCKETS_NETWORK_TYPE == NETWORK_ESP8266_ASYNC)