diff --git a/board/ti/am335x/Kconfig b/board/ti/am335x/Kconfig
index 0e5149c..80701f5 100644
--- a/board/ti/am335x/Kconfig
+++ b/board/ti/am335x/Kconfig
@@ -22,6 +22,7 @@
 
 config CONS_INDEX
 	int "UART used for console"
+	range 1 6
 	default 1
 	help
 	  The AM335x SoC has a total of 6 UARTs (UART0 to UART5 as referenced