diff --git a/src/Ble_esp32.h b/src/Ble_esp32.h
index 4da3490..313281d 100644
--- a/src/Ble_esp32.h
+++ b/src/Ble_esp32.h
@@ -4,6 +4,7 @@
 #include <BLEDevice.h>
 #include <BLEUtils.h>
 #include <BLEServer.h>
+#include <BLE2902.h>
 
 #include "utility/AbstractMidiInterface.h"
 using namespace Midi;