diff --git a/test/integration/fixtures/blocks/core__site-title.json b/test/integration/fixtures/blocks/core__site-title.json
index 8ca7091f30d5e7..dfbbf4abf87405 100644
--- a/test/integration/fixtures/blocks/core__site-title.json
+++ b/test/integration/fixtures/blocks/core__site-title.json
@@ -3,6 +3,7 @@
 		"name": "core/site-title",
 		"isValid": true,
 		"attributes": {
+			"content": "",
 			"level": 1,
 			"levelOptions": [ 0, 1, 2, 3, 4, 5, 6 ],
 			"isLink": true,