diff --git a/rendering/cases/reproj-image/main.js b/rendering/cases/reproj-image/main.js
index 4d36b4f31b..bc72087cf1 100644
--- a/rendering/cases/reproj-image/main.js
+++ b/rendering/cases/reproj-image/main.js
@@ -4,7 +4,7 @@ import Static from '../../../src/ol/source/ImageStatic.js';
 import {
   get as getProjection,
   transformExtent
-} from '../../../src/ol/proj';
+} from '../../../src/ol/proj.js';
 import ImageLayer from '../../../src/ol/layer/Image.js';
 
 const source = new Static({