diff --git a/components/style/values/specified/box.rs b/components/style/values/specified/box.rs
index bece7115c17..4890f225e6d 100644
--- a/components/style/values/specified/box.rs
+++ b/components/style/values/specified/box.rs
@@ -80,10 +80,8 @@ pub enum Display {
     #[cfg(feature = "gecko")]
     WebkitInlineBox,
     #[cfg(feature = "gecko")]
-    #[css(parse_condition = "moz_display_values_enabled")]
     MozBox,
     #[cfg(feature = "gecko")]
-    #[css(parse_condition = "moz_display_values_enabled")]
     MozInlineBox,
     #[cfg(feature = "gecko")]
     #[css(parse_condition = "moz_display_values_enabled")]