diff --git a/debian.master/config/enforce b/debian.master/config/enforce
index da948e3..0826d82 100644
--- a/debian.master/config/enforce
+++ b/debian.master/config/enforce
@@ -81,6 +81,6 @@ value CONFIG_IPV6 y
 # dependancies which can pull it =m at a whim.
 value CONFIG_ECRYPT_FS y
 
-# Ensure CONFIG_EFI_VARS is y as debian-installer relies on having
-# access to efivars when installing in EFI mode. See LP:837332
-value CONFIG_EFI_VARS y
+# Ensure CONFIG_EFI_VARS is y (if available) as debian-installer relies on
+# having access to efivars when installing in EFI mode. See LP:837332
+!exists CONFIG_EFI_VARS | value CONFIG_EFI_VARS y