diff --git a/src/ble_serial.cpp b/src/ble_serial.cpp
index b11e764..2341703 100644
--- a/src/ble_serial.cpp
+++ b/src/ble_serial.cpp
@@ -45,9 +45,8 @@ class BLESerialCharacteristicCallbacks: public BLECharacteristicCallbacks {
 BLESerial::BLESerial()
   : pService(NULL)
   , pTxCharacteristic(NULL)
+  , receiveBuffer("")
 {
-  // create instance  
-  receiveBuffer = "";
 }
 
 // Destructor