diff --git a/common/cmd_usb.c b/common/cmd_usb.c
index fcb5f76..73d74ac 100644
--- a/common/cmd_usb.c
+++ b/common/cmd_usb.c
@@ -349,7 +349,7 @@
  * usb boot command intepreter. Derived from diskboot
  */
 #ifdef CONFIG_USB_STORAGE
-int do_usbboot(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
+int do_usbboot(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 {
 	char *boot_device = NULL;
 	char *ep;
@@ -506,7 +506,7 @@
 /******************************************************************************
  * usb command intepreter
  */
-int do_usb(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
+int do_usb(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 {
 
 	int i;