diff --git a/src/mainboard/msi/h81m-p33/Kconfig b/src/mainboard/msi/h81m-p33/Kconfig
index 185c340d6c..de21a55a78 100644
--- a/src/mainboard/msi/h81m-p33/Kconfig
+++ b/src/mainboard/msi/h81m-p33/Kconfig
@@ -17,7 +17,7 @@ config BOARD_SPECIFIC_OPTIONS
 
 config MAINBOARD_DIR
 	string
-	default msi/h81m-p33
+	default "msi/h81m-p33"
 
 config MAINBOARD_PART_NUMBER
 	string