diff --git a/CHANGELOG.md b/CHANGELOG.md
index 350398e..4260b1b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,7 @@
 
 ### Fixed
 
+- Fix mobile devices duplication during mobile sync
 - Fix leftover data (profile rights and config values) after plugin uninstall
 
 ## [3.2.2] - 2026-08-03
diff --git a/inc/mobilesync.class.php b/inc/mobilesync.class.php
index c32bf60..091c840 100644
--- a/inc/mobilesync.class.php
+++ b/inc/mobilesync.class.php
@@ -720,12 +720,12 @@ public static function discover(): int
 
         $imported = [];
         $iterator = $DB->request([
-            'SELECT' => ['udid'],
+            'SELECT' => ['jamf_items_id'],
             'FROM'   => 'glpi_plugin_jamf_devices',
             'WHERE'  => ['jamf_type' => static::$jamf_itemtype],
         ]);
         foreach ($iterator as $data) {
-            $imported[] = $data['udid'];
+            $imported[] = (int) $data['jamf_items_id'];
         }
 
         $pending_iterator = $DB->request([
@@ -742,7 +742,7 @@ public static function discover(): int
 
         $config = Config::getConfigurationValues('plugin:Jamf');
         foreach ($jamf_devices as $jamf_device) {
-            if (!in_array($jamf_device['id'], $imported, true)) {
+            if (!in_array((int) $jamf_device['id'], $imported, true)) {
                 $itemtype = str_contains((string) $jamf_device['model_identifier'], 'iPhone') ? 'Phone' : 'Computer';
                 if (isset($config['autoimport']) && $config['autoimport']) {
                     try {
diff --git a/tests/units/PluginJamfMobileSync.php b/tests/units/PluginJamfMobileSync.php
index 615e8df..7d9bd33 100644
--- a/tests/units/PluginJamfMobileSync.php
+++ b/tests/units/PluginJamfMobileSync.php
@@ -193,6 +193,32 @@ public function testImportAsPhone()
         $this->assertEquals('1aec6610a9401d2cc47cb55e1a2f7b500ab75864', $ext_field['value']);
     }
 
+    public function testDiscoverSkipsAlreadyImportedDevices()
+    {
+        /** @var DBmysql $DB */
+        global $DB;
+
+        // Ensure the device is imported (may already be done by a previous test)
+        PluginJamfMobileTestSync::import('Phone', 5, false);
+        $this->assertGreaterThan(0, countElementsInTable('glpi_plugin_jamf_devices', [
+            'jamf_type'     => 'MobileDevice',
+            'jamf_items_id' => 5,
+        ]));
+
+        $DB->delete(PluginJamfImport::getTable(), ['jamf_type' => 'MobileDevice']);
+        PluginJamfMobileTestSync::discover();
+
+        // The imported device must not be queued again for import
+        $this->assertEquals(0, countElementsInTable(PluginJamfImport::getTable(), [
+            'jamf_type'     => 'MobileDevice',
+            'jamf_items_id' => 5,
+        ]));
+        // The other devices are still discovered
+        $this->assertEquals(5, countElementsInTable(PluginJamfImport::getTable(), [
+            'jamf_type' => 'MobileDevice',
+        ]));
+    }
+
     public static function deviceSyncEnginesProvider()
     {
         $engines = PluginJamfSync::getDeviceSyncEngines();