diff --git a/activitypub.php b/activitypub.php
index 5b19dce..3f582ea 100644
--- a/activitypub.php
+++ b/activitypub.php
@@ -15,6 +15,8 @@
 
 namespace Activitypub;
 
+\defined( 'ACTIVITYPUB_REST_NAMESPACE' ) || \define( 'ACTIVITYPUB_REST_NAMESPACE', 'activitypub/1.0' );
+
 /**
  * Initialize plugin
  */
@@ -25,8 +27,6 @@ function init() {
 	\defined( 'ACTIVITYPUB_HASHTAGS_REGEXP' ) || \define( 'ACTIVITYPUB_HASHTAGS_REGEXP', '(?:(?<=\s)|(?<=<p>)|(?<=<br>)|^)#([A-Za-z0-9_]+)(?:(?=\s|[[:punct:]]|$))' );
 	\defined( 'ACTIVITYPUB_USERNAME_REGEXP' ) || \define( 'ACTIVITYPUB_USERNAME_REGEXP', '(?:([A-Za-z0-9_-]+)@((?:[A-Za-z0-9_-]+\.)+[A-Za-z]+))' );
 	\defined( 'ACTIVITYPUB_CUSTOM_POST_CONTENT' ) || \define( 'ACTIVITYPUB_CUSTOM_POST_CONTENT', "<strong>[ap_title]</strong>\n\n[ap_content]\n\n[ap_hashtags]\n\n[ap_shortlink]" );
-	\defined( 'ACTIVITYPUB_REST_NAMESPACE' ) || \define( 'ACTIVITYPUB_REST_NAMESPACE', 'activitypub/1.0' );
-
 	\define( 'ACTIVITYPUB_PLUGIN_DIR', plugin_dir_path( __FILE__ ) );
 	\define( 'ACTIVITYPUB_PLUGIN_BASENAME', plugin_basename( __FILE__ ) );
 	\define( 'ACTIVITYPUB_PLUGIN_FILE', plugin_dir_path( __FILE__ ) . '/' . basename( __FILE__ ) );