diff --git a/extensions/markdown-language-features/src/test/engine.test.ts b/extensions/markdown-language-features/src/test/engine.test.ts
index c3eb7c85056..e398ed088ce 100644
--- a/extensions/markdown-language-features/src/test/engine.test.ts
+++ b/extensions/markdown-language-features/src/test/engine.test.ts
@@ -37,11 +37,11 @@ suite('markdown.engine', () => {
 			const engine = createNewMarkdownEngine();
 			assert.deepStrictEqual((await engine.render(input)), {
 				html: '<p data-line="0" class="code-line">'
-					+ '<img src="img.png" alt="" class="loading" id="image-hash--754511435"> '
+					+ '<img src="img.png" alt="" class="loading" id="image-hash--754511435" data-src="img.png"> '
 					+ '<a href="no-img.png" data-href="no-img.png"></a> '
-					+ '<img src="http://example.org/img.png" alt="" class="loading" id="image-hash--1903814170"> '
-					+ '<img src="img.png" alt="" class="loading" id="image-hash--754511435"> '
-					+ '<img src="./img2.png" alt="" class="loading" id="image-hash-265238964">'
+					+ '<img src="http://example.org/img.png" alt="" class="loading" id="image-hash--1903814170" data-src="http://example.org/img.png"> '
+					+ '<img src="img.png" alt="" class="loading" id="image-hash--754511435" data-src="img.png"> '
+					+ '<img src="./img2.png" alt="" class="loading" id="image-hash-265238964" data-src="./img2.png">'
 					+ '</p>\n'
 				,
 				containingImages: [{ src: 'img.png' }, { src: 'http://example.org/img.png' }, { src: 'img.png' }, { src: './img2.png' }],