diff --git a/packages/block-editor/src/components/iframe/index.js b/packages/block-editor/src/components/iframe/index.js
index 9d150a61cfefeb..4d4521eae35814 100644
--- a/packages/block-editor/src/components/iframe/index.js
+++ b/packages/block-editor/src/components/iframe/index.js
@@ -226,7 +226,7 @@ function Iframe( {
// content.
const html =
'' +
- '' +
+ '' +
( assets?.styles ?? '' );
const [ src, cleanup ] = useMemo( () => {