diff --git a/cmd/usb_mass_storage.c b/cmd/usb_mass_storage.c
index cb5260b..3353f95 100644
--- a/cmd/usb_mass_storage.c
+++ b/cmd/usb_mass_storage.c
@@ -133,7 +133,7 @@ cleanup:
 	return ret;
 }
 
-int do_usb_mass_storage(cmd_tbl_t *cmdtp, int flag,
+static int do_usb_mass_storage(cmd_tbl_t *cmdtp, int flag,
 			       int argc, char * const argv[])
 {
 	const char *usb_controller;