diff --git a/components/style/properties/longhands/inherited_box.mako.rs b/components/style/properties/longhands/inherited_box.mako.rs
index 8db62bf56d6..2542ee5e376 100644
--- a/components/style/properties/longhands/inherited_box.mako.rs
+++ b/components/style/properties/longhands/inherited_box.mako.rs
@@ -51,6 +51,7 @@ ${helpers.single_keyword(
     "mixed upright sideways",
     engines="gecko",
     gecko_aliases="sideways-right=sideways",
+    gecko_enum_prefix="StyleTextOrientation",
     animation_value_type="none",
     spec="https://drafts.csswg.org/css-writing-modes/#propdef-text-orientation",
 )}