diff --git a/src/BLE.cpp b/src/BLE.cpp
index a916557..5f230ff 100644
--- a/src/BLE.cpp
+++ b/src/BLE.cpp
@@ -38,7 +38,7 @@ public:
 };
 
 void otaCallback::onWrite(BLECharacteristic *pCharacteristic) {
-  String rxData = pCharacteristic->getValue();
+  auto rxData = pCharacteristic->getValue();
   if (!updateFlag) { // If it's the first packet of OTA since bootup, begin OTA
     // Serial.println("Begin FW Update");
     esp_ota_begin(esp_ota_get_next_update_partition(NULL), OTA_SIZE_UNKNOWN,
@@ -127,4 +127,4 @@ bool BLE::begin(const char *localName = "Watchy BLE OTA") {
 
 int BLE::updateStatus() { return status; }
 
-int BLE::howManyBytes() { return bytesReceived; }
\ No newline at end of file
+int BLE::howManyBytes() { return bytesReceived; }