diff --git a/src/mainboard/emulation/qemu-i440fx/Kconfig b/src/mainboard/emulation/qemu-i440fx/Kconfig
index 8632ef6..3c27b1e 100644
--- a/src/mainboard/emulation/qemu-i440fx/Kconfig
+++ b/src/mainboard/emulation/qemu-i440fx/Kconfig
@@ -42,7 +42,7 @@
 
 config MAINBOARD_DIR
 	string
-	default emulation/qemu-i440fx
+	default "emulation/qemu-i440fx"
 
 config MAINBOARD_PART_NUMBER
 	string