diff --git a/src/portable/microchip/samd51/hal_samd51.c b/src/portable/microchip/samd51/hal_samd51.c
index d8c71a7f..775c2900 100644
--- a/src/portable/microchip/samd51/hal_samd51.c
+++ b/src/portable/microchip/samd51/hal_samd51.c
@@ -44,13 +44,6 @@
 
 #include "tusb_hal.h"
 
-/*------------------------------------------------------------------*/
-/* MACRO TYPEDEF CONSTANT ENUM
- *------------------------------------------------------------------*/
-#define USB_NVIC_PRIO   7
-
-void tusb_hal_nrf_power_event(uint32_t event);
-
 /*------------------------------------------------------------------*/
 /* TUSB HAL
  *------------------------------------------------------------------*/