diff --git a/ble_examples/ble_uart_peripheral.py b/ble_examples/ble_uart_peripheral.py
index 14f7102..d90c20f 100644
--- a/ble_examples/ble_uart_peripheral.py
+++ b/ble_examples/ble_uart_peripheral.py
@@ -4,9 +4,9 @@
 from ble_advertising import advertising_payload
 
 from micropython import const
-_IRQ_CENTRAL_CONNECT                 = const(1 << 0)
-_IRQ_CENTRAL_DISCONNECT              = const(1 << 1)
-_IRQ_GATTS_WRITE                     = const(1 << 2)
+_IRQ_CENTRAL_CONNECT                 = const(1)
+_IRQ_CENTRAL_DISCONNECT              = const(2)
+_IRQ_GATTS_WRITE                     = const(3)
 
 _UART_UUID = bluetooth.UUID('6E400001-B5A3-F393-E0A9-E50E24DCCA9E')
 _UART_TX = (bluetooth.UUID('6E400003-B5A3-F393-E0A9-E50E24DCCA9E'), bluetooth.FLAG_NOTIFY,)