diff --git a/integration/class-friends-feed-parser-activitypub.php b/integration/class-friends-feed-parser-activitypub.php
index 34f3d77..db155c1 100644
--- a/integration/class-friends-feed-parser-activitypub.php
+++ b/integration/class-friends-feed-parser-activitypub.php
@@ -248,7 +248,7 @@ class Friends_Feed_Parser_ActivityPub extends \Friends\Feed_Parser {
 
 				$data['content'] .= PHP_EOL;
 				$data['content'] .= '<!-- wp:image -->';
-				$data['content'] .= '<p><img src="' . esc_url( $attachment['url'] ) . '" width="' . esc_attr( $attachment['width'] ) . '"  height="' . esc_attr( $attachment['height'] ) . '" /></p>';
+				$data['content'] .= '<p><img src="' . esc_url( $attachment['url'] ) . '" width="' . esc_attr( $attachment['width'] ) . '"  height="' . esc_attr( $attachment['height'] ) . '" class="size-full" /></p>';
 				$data['content'] .= '<!-- /wp:image  -->';
 			}
 			$meta = \Activitypub\get_remote_metadata_by_actor( $object['attributedTo'] );
diff --git a/tests/test-class-friends-feed-parser-activitypub.php b/tests/test-class-friends-feed-parser-activitypub.php
index f48efb1..79f5a74 100644
--- a/tests/test-class-friends-feed-parser-activitypub.php
+++ b/tests/test-class-friends-feed-parser-activitypub.php
@@ -68,7 +68,7 @@ class Test_Friends_Feed_Parser_ActivityPub extends \WP_UnitTestCase {
 
 		$this->assertEquals( $post_count + 1, count( $posts ) );
 		$this->assertStringStartsWith( $content, $posts[0]->post_content );
-		$this->assertStringContainsString( '<img src="' . esc_url( $attachment_url ) . '" width="' . esc_attr( $attachment_width ) . '" height="' . esc_attr( $attachment_height ) . '" />', $posts[0]->post_content );
+		$this->assertStringContainsString( '<img src="' . esc_url( $attachment_url ) . '" width="' . esc_attr( $attachment_width ) . '" height="' . esc_attr( $attachment_height ) . '"', $posts[0]->post_content );
 		$this->assertEquals( $this->friend_id, $posts[0]->post_author );
 
 		// Do another test post, this time with a URL that has an @-id.