diff --git a/classes/FeedEnclosure.php b/classes/FeedEnclosure.php
index 1e53de2e8..10dd2ae33 100644
--- a/classes/FeedEnclosure.php
+++ b/classes/FeedEnclosure.php
@@ -1,9 +1,9 @@
 <?php
 class FeedEnclosure {
-	public string $link;
-	public string $type;
-	public string $length;
-	public string $title;
-	public string $height;
-	public string $width;
+	public string $link = '';
+	public string $type = '';
+	public string $length = '';
+	public string $title = '';
+	public string $height = '';
+	public string $width = '';
 }