diff --git a/arch/blackfin/Kconfig b/arch/blackfin/Kconfig
index 31913fe..0a2fb4d 100644
--- a/arch/blackfin/Kconfig
+++ b/arch/blackfin/Kconfig
@@ -6,6 +6,7 @@
 
 choice
 	prompt "Target select"
+	optional
 
 config TARGET_BCT_BRETTL2
 	bool "Support bct-brettl2"