diff --git a/test/helpers.ts b/test/helpers.ts
index 4310032c49e3..52d137dfd459 100644
--- a/test/helpers.ts
+++ b/test/helpers.ts
@@ -145,7 +145,7 @@ export function normalizeHtml(window, html, { removeDataSvelte = false, preserve
 		const node = window.document.createElement('div');
 		node.innerHTML = html
 			.replace(/(<!--.*?-->)/g, preserveComments ? '$1' : '')
-			.replace(/(data-svelte="[^"]+")/g, removeDataSvelte ? '': '$1')
+			.replace(/(data-svelte="[^"]+")/g, removeDataSvelte ? '' : '$1')
 			.replace(/>[\s\r\n]+</g, '><')
 			.trim();
 		cleanChildren(node);