diff --git a/CHANGELOG.md b/CHANGELOG.md
index b5f37a1..14edb03 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,7 @@
 
 --- develop ---
 
+* 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))
 * security: Move the graph 'Add to QuickTree' icon's inline `onClick='addQuickTree()'` handler into a delegated jQuery binding in `js/quicktree.js` (via a `quicktreeAddLink` class and `data-` attributes) and replace the confirmation pages' inline `onClick='cactiReturnTo()'` Cancel buttons with the CSP-safe `cactiReturnTo` class, so the pages no longer trip Cacti's Content-Security-Policy script-src-attr directive
 * dev: Replace the translation-template CI check that regenerated locales/po/cacti.pot and compared it with a diff-based gate (tests/bin/check-i18n-pot.php) requiring cacti.pot to be updated only when a pull request adds, removes, or modifies an i18n function call
 * dev: Measure CI coverage with xdebug instead of pcov so the plugin's own sources are instrumented (pcov auto-scopes to the Composer root and skipped cacti/plugins/, leaving the patch-coverage gate with nothing to measure)
diff --git a/setup.php b/setup.php
index d43b47f..abd4931 100644
--- a/setup.php
+++ b/setup.php
@@ -423,7 +423,7 @@ function quicktree_check_upgrade(): void {
 		['quicktree']);
 
 	if ($current != $old) {
-		api_plugin_register_hook('quicktree', 'page_head', 'quicktree_page_head', 'setup.php', 1);
+		api_plugin_register_hook('quicktree', 'page_head', 'quicktree_page_head', 'setup.php', true);
 
 		quicktree_setup_table();
 
diff --git a/tests/Unit/QuicktreeCheckUpgradeTest.php b/tests/Unit/QuicktreeCheckUpgradeTest.php
index e39321c..3e69d4f 100644
--- a/tests/Unit/QuicktreeCheckUpgradeTest.php
+++ b/tests/Unit/QuicktreeCheckUpgradeTest.php
@@ -1,4 +1,4 @@
-<?php
+&lt;?php
 /*
  +-------------------------------------------------------------------------+
  | Copyright (C) 2004-2026 The Cacti Group                                 |
@@ -79,7 +79,7 @@
 	quicktree_check_upgrade();
 
 	$pageHeadHooks = array_filter($GLOBALS['__test_registered_hooks'], function ($hook) {
-		return $hook['hook'] === 'page_head' && $hook['enabled'] === 1;
+		return $hook['hook'] === 'page_head' && $hook['enabled'] === true;
 	});
 
 	expect($pageHeadHooks)->not->toBeEmpty();