diff --git a/src/AppSearch/Request/SearchEsSearch.php b/src/AppSearch/Request/SearchEsSearch.php
index 8327140..c6ffef1 100644
--- a/src/AppSearch/Request/SearchEsSearch.php
+++ b/src/AppSearch/Request/SearchEsSearch.php
@@ -36,7 +36,7 @@ public function __construct(string $engineName, string $authorization, EsSearchP
 	{
 		$this->method = 'POST';
 		$engine_name = urlencode($engineName);
-		$this->headers['Authorization'] = $authorization;
+		$this->setAuthorization($authorization);
 		$this->path = "/api/as/v1/engines/$engine_name/elasticsearch/_search";
 		$this->headers['Content-Type'] = 'application/json';
 		$this->body = $es_search_params;
diff --git a/tests/Integration/AppSearchTest.php b/tests/Integration/AppSearchTest.php
index 46a343d..1c03efb 100644
--- a/tests/Integration/AppSearchTest.php
+++ b/tests/Integration/AppSearchTest.php
@@ -236,8 +236,7 @@ public function testSearchEsSearch(string $id)
         ];
         
         $result = $this->appSearch->searchEsSearch(
-            (new Request\SearchEsSearch('test', $searchParams))
-                ->setAuthorization(getenv('ELASTICSEARCH_API_KEY'))
+            new Request\SearchEsSearch('test', getenv('ELASTICSEARCH_API_KEY'), $searchParams)
         );
         
         $this->assertCount(1, $result['hits']['hits']);