diff --git a/arch/Config.in b/arch/Config.in
index 472b10c7b2..795f24f467 100644
--- a/arch/Config.in
+++ b/arch/Config.in
@@ -25,6 +25,7 @@ config BR2_armeb
 
 config BR2_aarch64
 	bool "AArch64"
+	select BR2_ARCH_IS_64
 	help
 	  Aarch64 is a 64-bit architecture developed by ARM Holdings.
 	  http://www.arm.com/products/processors/instruction-set-architectures/armv8-architecture.php