diff --git a/packages/e2e-tests/src/plugins/disable-gravatar.php b/packages/e2e-tests/src/plugins/disable-gravatar.php
index 53411a62361a..70d8cebe1615 100644
--- a/packages/e2e-tests/src/plugins/disable-gravatar.php
+++ b/packages/e2e-tests/src/plugins/disable-gravatar.php
@@ -44,8 +44,8 @@ static function ( $avatar, $id_or_email, $size, $default, $alt ) {
 
 add_filter(
 	'get_avatar_url',
-	static function () {
-		return 'data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==';
+	static function ( $url ) {
+		return set_url_scheme( $url, 'https' );
 	},
 	1
 );