diff --git a/drivers/usb/gadget/f_fastboot.c b/drivers/usb/gadget/f_fastboot.c
index 199621d..f3382a9 100644
--- a/drivers/usb/gadget/f_fastboot.c
+++ b/drivers/usb/gadget/f_fastboot.c
@@ -561,7 +561,7 @@ static void do_bootm_on_complete(struct usb_ep *ep, struct usb_request *req)
 
 	puts("Booting kernel..\n");
 
-	sprintf(boot_addr_start, "0x%lx", CONFIG_FASTBOOT_BUF_ADDR);
+	sprintf(boot_addr_start, "0x%lx", (long)CONFIG_FASTBOOT_BUF_ADDR);
 	do_bootm(NULL, 0, 2, bootm_args);
 
 	/* This only happens if image is somehow faulty so we start over */