diff --git a/include/dwc3-uboot.h b/include/dwc3-uboot.h
index 09ff8a7..7af2ad1 100644
--- a/include/dwc3-uboot.h
+++ b/include/dwc3-uboot.h
@@ -13,7 +13,7 @@
 #include <linux/usb/otg.h>
 
 struct dwc3_device {
-	int base;
+	unsigned long base;
 	enum usb_dr_mode dr_mode;
 	u32 maximum_speed;
 	unsigned tx_fifo_resize:1;