diff --git a/components/style/properties/longhands/list.mako.rs b/components/style/properties/longhands/list.mako.rs
index 3991725553e..096ebcd96db 100644
--- a/components/style/properties/longhands/list.mako.rs
+++ b/components/style/properties/longhands/list.mako.rs
@@ -11,6 +11,7 @@ ${helpers.single_keyword(
     "outside inside",
     engines="gecko servo",
     servo_pref="layout.legacy_layout",
+    gecko_enum_prefix="StyleListStylePosition",
     animation_value_type="discrete",
     spec="https://drafts.csswg.org/css-lists/#propdef-list-style-position",
     servo_restyle_damage="rebuild_and_reflow",