diff --git a/CHANGELOG.md b/CHANGELOG.md
index 647f73e..6151088 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,7 @@
 
 --- 3.0 ---
 
+* bug: Pass a boolean (not the integer 1) to api_plugin_register_hook()'s $enable argument so the hook registration stays type-correct under Cacti 1.3's strict bool type-hint (the int only coerces while the file lacks declare(strict_types=1))
 * feature: Adopt the Cacti plugin table API and relocate schema provisioning into includes/database.php
 * feature: Add a fleet-wide manifest.json with upgrade-time file pruning
 * feature: Consolidate per-theme override stylesheets from themes/ into css/
diff --git a/setup.php b/setup.php
index bc3dacd..3a01467 100644
--- a/setup.php
+++ b/setup.php
@@ -334,7 +334,7 @@ function monitor_check_upgrade() {
 		monitor_setup_table();
 		monitor_upgrade_tables();
 
-		api_plugin_register_hook('monitor', 'page_head', 'plugin_monitor_page_head', 'setup.php', 1);
+		api_plugin_register_hook('monitor', 'page_head', 'plugin_monitor_page_head', 'setup.php', true);
 
 		db_execute('ALTER TABLE host MODIFY COLUMN monitor char(3) DEFAULT "on"');