diff --git a/libraries/ESP8266WiFi/src/WiFiClientSecureBearSSL.cpp b/libraries/ESP8266WiFi/src/WiFiClientSecureBearSSL.cpp
index e60e292bd4..bc68ed3daf 100644
--- a/libraries/ESP8266WiFi/src/WiFiClientSecureBearSSL.cpp
+++ b/libraries/ESP8266WiFi/src/WiFiClientSecureBearSSL.cpp
@@ -1500,7 +1500,7 @@ bool WiFiClientSecure::probeMaxFragmentLength(IPAddress ip, uint16_t port, uint1
 
   ret = probe.readBytes(extBytes, 2);
   handLen -= ret;
-  extLen = extBytes[1] || (extBytes[0]<<8);
+  extLen = extBytes[1] | (extBytes[0]<<8);
   if ((extLen == 0) || (ret != 2)) {
     return _SendAbort(probe, supportsLen);
   }