diff --git a/includes/class-admin.php b/includes/class-admin.php
index b5000ff..4d8655a 100644
--- a/includes/class-admin.php
+++ b/includes/class-admin.php
@@ -25,7 +25,7 @@ class Admin {
 		}
 
 		add_filter(
-			'activitypub/transformers/is_transformer_enabled',
+			'activitypub_transformers_is_transformer_enabled',
 			function( $should_register, Transformer_Base $transformer_instance ) {
 				return ! Options::is_transformer_disabled( $transformer_instance->get_name() );
 			},