diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index a4f24f5..01af853 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -1549,6 +1549,7 @@
 config EFI
 	bool "EFI runtime service support"
 	depends on ACPI
+	select UCS2_STRING
 	---help---
 	  This enables the kernel to use EFI runtime services that are
 	  available (such as the EFI variable services).