diff --git a/app/Http/Controllers/ReportsController.php b/app/Http/Controllers/ReportsController.php
index f0bbfb74a..33188d0c0 100644
--- a/app/Http/Controllers/ReportsController.php
+++ b/app/Http/Controllers/ReportsController.php
@@ -1177,10 +1177,9 @@ class ReportsController extends Controller
         $locale = $assetItem->assignedTo?->locale;
         // Only send notification if assigned
         if ($locale && $email) {
-            Mail::to($email)->send((new CheckoutAssetMail($assetItem, $assetItem->assignedTo, $logItem->user, $acceptance, $logItem->note))->locale($locale));
-
+            Mail::to($email)->send((new CheckoutAssetMail($assetItem, $assetItem->assignedTo, $logItem->user, $acceptance, $logItem->note, firstTimeSending: false))->locale($locale));
             } elseif ($email) {
-            Mail::to($email)->send((new CheckoutAssetMail($assetItem, $assetItem->assignedTo, $logItem->user, $acceptance, $logItem->note)));
+            Mail::to($email)->send((new CheckoutAssetMail($assetItem, $assetItem->assignedTo, $logItem->user, $acceptance, $logItem->note, firstTimeSending: false)));
             }
 
         if ($email == ''){
diff --git a/app/Mail/CheckoutAssetMail.php b/app/Mail/CheckoutAssetMail.php
index 680014dcd..fbdaa4fcc 100644
--- a/app/Mail/CheckoutAssetMail.php
+++ b/app/Mail/CheckoutAssetMail.php
@@ -20,10 +20,12 @@ class CheckoutAssetMail extends Mailable
 {
     use Queueable, SerializesModels;
 
+    private bool $firstTimeSending;
+
     /**
      * Create a new message instance.
      */
-    public function __construct(Asset $asset, $checkedOutTo, User $checkedOutBy,  $acceptance, $note)
+    public function __construct(Asset $asset, $checkedOutTo, User $checkedOutBy, $acceptance, $note, bool $firstTimeSending = true)
     {
         $this->item = $asset;
         $this->admin = $checkedOutBy;
@@ -36,6 +38,8 @@ class CheckoutAssetMail extends Mailable
         $this->last_checkout = '';
         $this->expected_checkin = '';
 
+        $this->firstTimeSending = $firstTimeSending;
+
         if ($this->item->last_checkout) {
             $this->last_checkout = Helper::getFormattedDateObject($this->item->last_checkout, 'date',
                 false);
@@ -54,9 +58,16 @@ class CheckoutAssetMail extends Mailable
     {
         $from = new Address(config('mail.from.address'), config('mail.from.name'));
 
+        $subject = trans('mail.Asset_Checkout_Notification');
+
+        if (!$this->firstTimeSending) {
+            // @todo: translate
+            $subject = 'Reminder: ' . $subject;
+        }
+
         return new Envelope(
             from: $from,
-            subject: trans('mail.Asset_Checkout_Notification'),
+            subject: $subject,
         );
     }
 
diff --git a/tests/Feature/Notifications/Email/AssetAcceptanceReminderTest.php b/tests/Feature/Notifications/Email/AssetAcceptanceReminderTest.php
index 3809b826e..d84b2f712 100644
--- a/tests/Feature/Notifications/Email/AssetAcceptanceReminderTest.php
+++ b/tests/Feature/Notifications/Email/AssetAcceptanceReminderTest.php
@@ -6,6 +6,7 @@ use App\Mail\CheckoutAssetMail;
 use App\Models\CheckoutAcceptance;
 use App\Models\User;
 use Illuminate\Support\Facades\Mail;
+use PHPUnit\Framework\Attributes\DataProvider;
 use Tests\TestCase;
 
 class AssetAcceptanceReminderTest extends TestCase
@@ -67,16 +68,36 @@ class AssetAcceptanceReminderTest extends TestCase
         Mail::assertNotSent(CheckoutAssetMail::class);
     }
 
-    public function testReminderIsSentToUser()
+    public static function users()
     {
+        yield 'User with locale set' => [
+            function () {
+                return CheckoutAcceptance::factory()->pending()->create();
+            }
+        ];
+
+        yield 'User without locale set' => [
+            function () {
+                $checkoutAcceptance = CheckoutAcceptance::factory()->pending()->create();
+                $checkoutAcceptance->assignedTo->update(['locale' => null]);
+
+                return $checkoutAcceptance;
+            }
+        ];
+    }
+
+    #[DataProvider('users')]
+    public function testReminderIsSentToUser($data)
+    {
+        $checkoutAcceptance = $data();
+
         $this->actingAs($this->actor)
-            ->post($this->routeFor($this->checkoutAcceptance))
+            ->post($this->routeFor($checkoutAcceptance))
             ->assertRedirect(route('reports/unaccepted_assets'));
 
         Mail::assertSent(CheckoutAssetMail::class, 1);
-        Mail::assertSent(CheckoutAssetMail::class, function (CheckoutAssetMail $mail) {
-            return $mail->hasTo($this->checkoutAcceptance->assignedTo->email)
-                // @todo:
+        Mail::assertSent(CheckoutAssetMail::class, function (CheckoutAssetMail $mail) use ($checkoutAcceptance) {
+            return $mail->hasTo($checkoutAcceptance->assignedTo->email)
                 && $mail->hasSubject('Reminder: ' . trans('mail.Asset_Checkout_Notification'));
         });
     }