diff --git a/include/command.h b/include/command.h
index 37e118c..f1accd0 100644
--- a/include/command.h
+++ b/include/command.h
@@ -71,7 +71,7 @@
 cmd_tbl_t *find_cmd(const char *cmd);
 cmd_tbl_t *find_cmd_tbl (const char *cmd, cmd_tbl_t *table, int table_len);
 
-extern int cmd_usage(cmd_tbl_t *cmdtp);
+extern int cmd_usage(const cmd_tbl_t *cmdtp);
 
 #ifdef CONFIG_AUTO_COMPLETE
 extern int var_complete(int argc, char * const argv[], char last_char, int maxv, char *cmdv[]);