diff --git a/src/hb-aat-layout-just-table.hh b/src/hb-aat-layout-just-table.hh
index 54ffec22f..92ca6603e 100644
--- a/src/hb-aat-layout-just-table.hh
+++ b/src/hb-aat-layout-just-table.hh
@@ -309,8 +309,8 @@ struct WidthDeltaPair
   public:
   DEFINE_SIZE_STATIC (24);
 };
-
-struct WidthDeltaCluster : OT::LArrayOf<WidthDeltaPair> {};
+  
+typedef OT::LArrayOf<WidthDeltaPair> WidthDeltaCluster;
 
 struct JustificationCategory
 {