diff --git a/src/Presentation/Api/V1/Http/Requests/Employees/EmployeesIndexRequest.php b/src/Presentation/Api/V1/Http/Requests/Employees/EmployeesIndexRequest.php
index 37a6a6b..5ca3169 100644
--- a/src/Presentation/Api/V1/Http/Requests/Employees/EmployeesIndexRequest.php
+++ b/src/Presentation/Api/V1/Http/Requests/Employees/EmployeesIndexRequest.php
@@ -42,6 +42,22 @@ final class EmployeesIndexRequest extends FormRequest
         ];
     }
 
+    #[\Override]
+    protected function prepareForValidation(): void
+    {
+        if ($this->has('siteIds')) {
+            $siteIds = $this->input('siteIds');
+            if (is_string($siteIds)) {
+                $trimmed = trim($siteIds);
+                $this->merge([
+                    'siteIds' => $trimmed === ''
+                        ? []
+                        : (str_contains($trimmed, ',') ? array_map('trim', explode(',', $trimmed)) : [$trimmed]),
+                ]);
+            }
+        }
+    }
+
     public function sorter(): EmployeeSorter
     {
         return new EmployeeSorter($this->sortBy(), $this->direction());
diff --git a/tests/Feature/Api/V1/Employees/EmployeesIndexTest.php b/tests/Feature/Api/V1/Employees/EmployeesIndexTest.php
index 8fd0863..1f78551 100644
--- a/tests/Feature/Api/V1/Employees/EmployeesIndexTest.php
+++ b/tests/Feature/Api/V1/Employees/EmployeesIndexTest.php
@@ -148,6 +148,32 @@ describe('Employees Index Feature API', function (): void {
         $response->assertJsonCount(2, 'employees');
     });
 
+    it('returns 200 OK and filters results for siteIds scalar query filter without brackets', function (): void {
+        // GIVEN
+        RuPersonneSirhFactory::truncate();
+
+        RuPersonneSirhFactory::new()->create([
+            'MATRICULE_FIC' => '01155902',
+            'SITE_FIC'      => 'LDCSER',
+        ]);
+
+        RuPersonneSirhFactory::new()->create([
+            'MATRICULE_FIC' => '01155903',
+            'SITE_FIC'      => 'SLELA',
+        ]);
+
+        /** @var \Tests\TestCase $test */
+        $test = $this;
+
+        // WHEN
+        $response = $test->getJson('/api/v1/employees?siteIds=LDCSER');
+
+        // THEN
+        $response->assertStatus(200);
+        $response->assertJsonCount(1, 'employees');
+        $response->assertJsonPath('employees.0.matricule', '01155902');
+    });
+
     it('ignores database rows with invalid matricules like comments or alphanumeric strings', function (): void {
         // GIVEN
         RuPersonneSirhFactory::truncate();