diff --git a/test/runtime/samples/spread-width-height-attributes/_config.js b/test/runtime/samples/spread-width-height-attributes/_config.js
index 1559ab3fd0..cf2dc7efde 100644
--- a/test/runtime/samples/spread-width-height-attributes/_config.js
+++ b/test/runtime/samples/spread-width-height-attributes/_config.js
@@ -1,4 +1,4 @@
 export default {
 	// https://github.com/sveltejs/svelte/issues/6752
-	html: `<img height="100%" width="100%" alt="" />`
+	html: '<img height="100%" width="100%" alt="" />'
 };