diff --git a/src/TinyGsmClientA6.h b/src/TinyGsmClientA6.h
index 449d330..15a19f1 100644
--- a/src/TinyGsmClientA6.h
+++ b/src/TinyGsmClientA6.h
@@ -593,7 +593,7 @@ protected:
     return len;
   }
 
-  bool modemGetConnected(uint8_t mux) {
+  bool modemGetConnected(uint8_t) {
     sendAT(GF("+CIPSTATUS")); //TODO mux?
     int res = waitResponse(GF(",\"CONNECTED\""), GF(",\"CLOSED\""), GF(",\"CLOSING\""), GF(",\"INITIAL\""));
     waitResponse();