diff --git a/etc/rc b/etc/rc
index f5d5ea561d..4302302f5c 100755
--- a/etc/rc
+++ b/etc/rc
@@ -306,6 +306,9 @@ echo "Bootup complete"
 
 /usr/local/bin/beep.sh start 2>&1 >/dev/null
 
+# Reset the cache.  read-only requires this.
+rm /tmp/config.cache
+
 etc/rc.conf_mount_ro
 
 exit 0