diff --git a/src/Curl/HttpClient.php b/src/Curl/HttpClient.php
index d068cf5..eaaaca1 100644
--- a/src/Curl/HttpClient.php
+++ b/src/Curl/HttpClient.php
@@ -88,7 +88,7 @@ private function execute(RequestInterface $request, $httpClient): ResponseInterf
 
         $headerSize = curl_getinfo($httpClient, CURLINFO_HEADER_SIZE);
         $headerString = substr($response, 0, $headerSize);
-        $headers = array_filter(explode("\n", $headerString), 'trim');
+        $headers = array_filter(array_map('trim', explode("\n", $headerString)));
 
         $body = substr($response, $headerSize);
 
@@ -99,4 +99,4 @@ private function closeHttpClient($httpClient)
     {
         curl_close($httpClient);
     }
-}
\ No newline at end of file
+}