diff --git a/src/browser/ColorManager.test.ts b/src/browser/ColorManager.test.ts
index 39a8f8c2..766f4c12 100644
--- a/src/browser/ColorManager.test.ts
+++ b/src/browser/ColorManager.test.ts
@@ -11,7 +11,7 @@ describe('ColorManager', () => {
   let cm: ColorManager;
   let dom: jsdom.JSDOM;
   let document: Document;
-  let window: Window;
+  let window: jsdom.DOMWindow;
 
   beforeEach(() => {
     dom = new jsdom.JSDOM('');