diff --git a/arch/risc-v/Kconfig b/arch/risc-v/Kconfig
index ed89a17ad5..3b37e6a916 100644
--- a/arch/risc-v/Kconfig
+++ b/arch/risc-v/Kconfig
@@ -295,6 +295,7 @@ config ARCH_CHIP_BL808
 	select ARCH_HAVE_MULTICPU
 	select ARCH_HAVE_MPU
 	select ARCH_MMU_TYPE_SV39
+	select ARCH_MMU_EXT_THEAD
 	select ARCH_HAVE_ADDRENV
 	select ARCH_NEED_ADDRENV_MAPPING
 	select ARCH_HAVE_S_MODE