diff --git a/libraries/BluetoothSerial/src/BluetoothSerial.cpp b/libraries/BluetoothSerial/src/BluetoothSerial.cpp
index e430fe7255e..800ef97e68c 100644
--- a/libraries/BluetoothSerial/src/BluetoothSerial.cpp
+++ b/libraries/BluetoothSerial/src/BluetoothSerial.cpp
@@ -54,7 +54,7 @@ static TaskHandle_t _spp_task_handle = NULL;
 static EventGroupHandle_t _spp_event_group = NULL;
 static EventGroupHandle_t _bt_event_group = NULL;
 static boolean secondConnectionAttempt;
-static esp_spp_cb_t * custom_spp_callback = NULL;
+static esp_spp_cb_t custom_spp_callback = NULL;
 static BluetoothSerialDataCb custom_data_callback = NULL;
 static esp_bd_addr_t current_bd_addr;
 static ConfirmRequestCb confirm_request_callback = NULL;
@@ -886,7 +886,7 @@ void BluetoothSerial::confirmReply(boolean confirm)
 }
 
 
-esp_err_t BluetoothSerial::register_callback(esp_spp_cb_t * callback)
+esp_err_t BluetoothSerial::register_callback(esp_spp_cb_t callback)
 {
     custom_spp_callback = callback;
     return ESP_OK;
diff --git a/libraries/BluetoothSerial/src/BluetoothSerial.h b/libraries/BluetoothSerial/src/BluetoothSerial.h
index 0c087b06360..4b225239333 100644
--- a/libraries/BluetoothSerial/src/BluetoothSerial.h
+++ b/libraries/BluetoothSerial/src/BluetoothSerial.h
@@ -53,7 +53,7 @@ class BluetoothSerial: public Stream
         void end(void);
         void setTimeout(int timeoutMS);
         void onData(BluetoothSerialDataCb cb);
-        esp_err_t register_callback(esp_spp_cb_t * callback);
+        esp_err_t register_callback(esp_spp_cb_t callback);
         
         void onConfirmRequest(ConfirmRequestCb cb);
         void onAuthComplete(AuthCompleteCb cb);