diff --git a/activitypub/transformer/class-tribe.php b/activitypub/transformer/class-tribe.php
index 4c2bf3f..2211b3a 100644
--- a/activitypub/transformer/class-tribe.php
+++ b/activitypub/transformer/class-tribe.php
@@ -63,7 +63,7 @@ class Tribe extends \Activitypub\Transformer\Base {
 	 * @access public
 	 * @return array Widget categories.
 	 */
-	public function get_supported_post_types() {
+	public static function get_supported_post_types() {
 		return array( 'tribe_events' );
 	}
 }
diff --git a/activitypub/transformer/class-vs-event.php b/activitypub/transformer/class-vs-event.php
index 966aea0..be7d2eb 100644
--- a/activitypub/transformer/class-vs-event.php
+++ b/activitypub/transformer/class-vs-event.php
@@ -68,7 +68,7 @@ class VS_Event extends \Activitypub\Transformer\Base {
 	 * @access public
 	 * @return array Widget categories.
 	 */
-	public function get_supported_post_types() {
+	public static function get_supported_post_types() {
 		return array( 'event' );
 	}