diff --git a/src/compiler/compile/render_dom/Renderer.ts b/src/compiler/compile/render_dom/Renderer.ts
index 5e4f6a34dc..29389ed3c3 100644
--- a/src/compiler/compile/render_dom/Renderer.ts
+++ b/src/compiler/compile/render_dom/Renderer.ts
@@ -225,6 +225,7 @@ export default class Renderer {
 				bitmask[i].n |= n;
 				bitmask[i].names.push(name);
 			});
+			return bitmask;
 		};
 
 		let operator;