diff --git a/sys/boot/usb/bsd_usbloader_test.c b/sys/boot/usb/bsd_usbloader_test.c
index 8744e2e76356..35140b87c360 100644
--- a/sys/boot/usb/bsd_usbloader_test.c
+++ b/sys/boot/usb/bsd_usbloader_test.c
@@ -57,6 +57,12 @@ DELAY(unsigned int delay)
 	usleep(delay);
 }
 
+void
+delay(unsigned int delay)
+{
+	usleep(delay);
+}
+
 int
 pause(const char *what, int timeout)
 {