diff --git a/ports/stm32f3/boards.c b/ports/stm32f3/boards.c
index 7d56962..7b6f02d 100644
--- a/ports/stm32f3/boards.c
+++ b/ports/stm32f3/boards.c
@@ -316,8 +316,7 @@ int board_uart_write(void const * buf, int len)
 #endif
 }
 
-#ifndef TINYUF2_SELF_UPDATE
-
+#ifndef BUILD_NO_TINYUSB
 // Forward USB interrupt events to TinyUSB IRQ Handler
 void USB_HP_IRQHandler(void)
 {