diff --git a/packages/block-library/src/post-featured-image/style.scss b/packages/block-library/src/post-featured-image/style.scss
index e740b8c56e608..70022d82902f8 100644
--- a/packages/block-library/src/post-featured-image/style.scss
+++ b/packages/block-library/src/post-featured-image/style.scss
@@ -5,7 +5,7 @@
 		display: block;
 		height: 100%;
 	}
-	img {
+	:where(img) {
 		max-width: 100%;
 		width: 100%;
 		height: auto;