diff --git a/CHANGELOG.md b/CHANGELOG.md
index 50a4ee8..5ba19b6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,7 @@
 
 --- develop ---
 
+* bug: Guard the pre-1.3 report compatibility shims (reports_run/reports_queue/reports_log_and_notify) behind a function_exists() check instead of a CACTI_VERSION string comparison, so a develop build that reports a version comparing < 1.3 no longer fatally redeclares those now-native functions
 * security: Move the plugin's remaining inline event handlers to CSP-safe bindings so the pages no longer trip Cacti's Content-Security-Policy script-src-attr directive: confirmation Cancel buttons use the `cactiReturnTo` class, the database/filter selects are bound via change() in their ready blocks, and the main filter's sort/report selects and time-shift icons are bound in flowview_display_filter's ready block
 * 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
 * issue: Prevent flow-capture from fatally erroring (TypeError in spl_object_hash) when flowview_db_check_reconnect() held a null shared-database handle; normalize a non-object connection to false so db_check_reconnect() checks and reconnects the default connection instead
diff --git a/includes/functions.php b/includes/functions.php
index 9c41102..55a1850 100644
--- a/includes/functions.php
+++ b/includes/functions.php
@@ -23,7 +23,11 @@
  +-------------------------------------------------------------------------+
 */
 
-if (version_compare(CACTI_VERSION, '1.3', '<')) {
+// reports_run()/reports_queue()/reports_log_and_notify() are native in Cacti
+// 1.3+. Load the compat shims only when they are actually missing: a develop
+// build can report a version that compares < 1.3 while already defining them
+// natively, and unconditionally including the shims would fatally redeclare them.
+if (!function_exists('reports_run')) {
 	require_once(__DIR__ . '/functions-pre13.php');
 }
 
diff --git a/tests/Unit/ReportsShimGuardTest.php b/tests/Unit/ReportsShimGuardTest.php
new file mode 100644
index 0000000..a24d538
--- /dev/null
+++ b/tests/Unit/ReportsShimGuardTest.php
@@ -0,0 +1,50 @@
+<?php
+/*
+ +-------------------------------------------------------------------------+
+ | Copyright (C) 2004-2026 The Cacti Group                                 |
+ +-------------------------------------------------------------------------+
+*/
+
+/*
+ * Regression guard for includes/functions.php. On Cacti 1.3 the report helpers
+ * are native, so loading the plugin file must not redeclare them. CI checks out
+ * Cacti 1.2.x (helpers absent) and the bootstrap has already required
+ * functions.php, so this exercises the develop-only "natives present" path in a
+ * clean child process where the three functions are defined up front.
+ */
+
+it('loads functions.php without redeclaring the native report helpers', function () {
+	$functions = dirname(__DIR__, 2) . '/includes/functions.php';
+
+	expect(is_readable($functions))->toBeTrue();
+
+	$script = <<<'CHILD'
+<?php
+error_reporting(E_ALL);
+ini_set('display_errors', '1');
+
+// Simulate Cacti 1.3, where these are defined natively before the plugin loads.
+function reports_run($id) { return true; }
+function reports_queue($name, $request_type, $source, $source_id, $command, $notification) {}
+function reports_log_and_notify($id, $start_time, $report_type, $source, $source_id, $subject, &$raw_data, &$oput_raw, &$oput_html, &$oput_text, $attachments = [], $headers = []) {}
+
+require $argv[1];
+
+echo '<<<LOADED_OK>>>';
+CHILD;
+
+	$tmp = tempnam(sys_get_temp_dir(), 'pre13_');
+	expect($tmp)->not->toBeFalse();
+
+	try {
+		file_put_contents($tmp, $script);
+
+		$command = escapeshellarg(PHP_BINARY) . ' ' . escapeshellarg($tmp) . ' ' . escapeshellarg($functions);
+		$output  = (string) shell_exec($command);
+
+		expect($output)->toContain('<<<LOADED_OK>>>');
+		expect($output)->not->toContain('redeclare');
+	} finally {
+		@unlink($tmp);
+	}
+});