diff --git a/sw/airborne/arch/lpc21/usb_tunnel.c b/sw/airborne/arch/lpc21/usb_tunnel.c
index f7f324da24..aeef32b1dc 100644
--- a/sw/airborne/arch/lpc21/usb_tunnel.c
+++ b/sw/airborne/arch/lpc21/usb_tunnel.c
@@ -53,7 +53,7 @@ int main( void ) {
   VCOM_init();
 #endif
 
-  int_enable();
+  mcu_int_enable();
 
   LED_ON(3);