diff --git a/src/hb-ot-var-hvar-table.hh b/src/hb-ot-var-hvar-table.hh
index 9931a5e60..3a2a82037 100644
--- a/src/hb-ot-var-hvar-table.hh
+++ b/src/hb-ot-var-hvar-table.hh
@@ -71,10 +71,10 @@ struct DeltaSetIndexMap
   }
 
   protected:
-  inline bool get_width (void) const
+  inline unsigned int get_width (void) const
   { return ((format >> 4) & 3) + 1; }
 
-  inline bool get_inner_bitcount (void) const
+  inline unsigned int get_inner_bitcount (void) const
   { return (format & 0xF) + 1; }
 
   protected: