diff --git a/common/cmd_misc.c b/common/cmd_misc.c
index b0ced2f..8439da2 100644
--- a/common/cmd_misc.c
+++ b/common/cmd_misc.c
@@ -27,7 +27,7 @@
 #include <common.h>
 #include <command.h>
 
-int do_sleep (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
+int do_sleep (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 {
 	ulong start = get_timer(0);
 	ulong delay;