diff --git a/common/console_simple.c b/common/console_simple.c
index 73e4752..49c5b33 100644
--- a/common/console_simple.c
+++ b/common/console_simple.c
@@ -167,4 +167,5 @@
 
 int console_unregister(struct console_device *cdev)
 {
+	return -EBUSY;
 }