diff --git a/browser/mocha_tests/helper/canvasContainerSetup.ts b/browser/mocha_tests/helper/canvasContainerSetup.ts
index 9c63bfbf4..5d795ed67 100644
--- a/browser/mocha_tests/helper/canvasContainerSetup.ts
+++ b/browser/mocha_tests/helper/canvasContainerSetup.ts
@@ -1,4 +1,5 @@
 /// <reference path="../../src/layer/tile/CanvasSectionContainer.ts" />
+/// <reference path="../../src/layer/tile/TilesSection.ts" />
 
 function canvasDomString() {
     return `