diff --git a/components/style/properties/longhands/inherited_text.mako.rs b/components/style/properties/longhands/inherited_text.mako.rs
index 46e79dc1f56..ae568c99295 100644
--- a/components/style/properties/longhands/inherited_text.mako.rs
+++ b/components/style/properties/longhands/inherited_text.mako.rs
@@ -342,6 +342,7 @@ ${helpers.single_keyword(
     engines="gecko",
     animation_value_type="discrete",
     spec="https://drafts.csswg.org/css-ruby/#ruby-position-property",
+    gecko_enum_prefix="StyleRubyPosition",
 )}
 
 // CSS Writing Modes Module Level 3