diff --git a/blocks/gallery-block/themes/news.json b/blocks/gallery-block/themes/news.json
index 0d1732990f..59ce2c51de 100644
--- a/blocks/gallery-block/themes/news.json
+++ b/blocks/gallery-block/themes/news.json
@@ -48,7 +48,7 @@
 				"overflow": "auto",
 				"components": {
 					"image": {
-						"block-size": "auto",
+						"block-size": "100%",
 						"max-block-size": "100%",
 						"max-inline-size": "100%",
 						"object-fit": "contain"