diff --git a/apps/dav/lib/Avatars/AvatarHome.php b/apps/dav/lib/Avatars/AvatarHome.php
index d72bfa3220..17ac37dc8a 100644
--- a/apps/dav/lib/Avatars/AvatarHome.php
+++ b/apps/dav/lib/Avatars/AvatarHome.php
@@ -110,7 +110,7 @@ class AvatarHome implements ICollection {
 	/**
 	 * Returns the last modification time, as a unix timestamp
 	 *
-	 * @return int
+	 * @return int|null
 	 */
 	public function getLastModified() {
 		return null;