diff --git a/arch/um/drivers/ubd_kern.c b/arch/um/drivers/ubd_kern.c
index 4fe4d6b7307067d93c3b963d4c61be3e22590c41..b498f27401005fddc119d85383c267a525b0aa4d 100644
--- a/arch/um/drivers/ubd_kern.c
+++ b/arch/um/drivers/ubd_kern.c
@@ -444,7 +444,7 @@ __uml_help(ubd_setup,
 "    cluster filesystem and inappropriate at almost all other times.\n\n"
 );
 
-static int udb_setup(const char *str)
+static int udb_setup(char *str)
 {
 	printk("udb%s specified on command line is almost certainly a ubd -> "
 	       "udb TYPO\n", str);