diff --git a/vexflow/vexflow.d.ts b/vexflow/vexflow.d.ts
index 070728212..815c8c931 100644
--- a/vexflow/vexflow.d.ts
+++ b/vexflow/vexflow.d.ts
@@ -1142,7 +1142,7 @@ declare module Vex {
         }
         
         class TabStave extends Stave {
-            constructor(x : number, y : number, width : number, options : {vertical_bar_width? : number, glyph_spacing_px? : number, num_lines? : number, fill_style? : string, spacing_between_lines_px? : number, space_above_staff_ln? : number, space_below_staff_ln? : number, top_text_position? : number});
+            constructor(x : number, y : number, width : number, options? : {vertical_bar_width? : number, glyph_spacing_px? : number, num_lines? : number, fill_style? : string, spacing_between_lines_px? : number, space_above_staff_ln? : number, space_below_staff_ln? : number, top_text_position? : number});
             getYForGlyphs() : number;
             addTabGlyph() : TabStave;
         }