diff --git a/arch/microblaze/Kconfig b/arch/microblaze/Kconfig
index 6f419f0..077b2a7 100644
--- a/arch/microblaze/Kconfig
+++ b/arch/microblaze/Kconfig
@@ -6,6 +6,7 @@
 
 choice
 	prompt "Target select"
+	optional
 
 config TARGET_MICROBLAZE_GENERIC
 	bool "Support microblaze-generic"