diff --git a/board/sunxi/Kconfig b/board/sunxi/Kconfig
index c1ae6f5..323e972 100644
--- a/board/sunxi/Kconfig
+++ b/board/sunxi/Kconfig
@@ -18,6 +18,7 @@
 
 choice
 	prompt "Sunxi SoC Variant"
+	optional
 
 config MACH_SUN4I
 	bool "sun4i (Allwinner A10)"