diff --git a/src/Client/Adapter/Curl.php b/src/Client/Adapter/Curl.php
index 6e2323d5d2..be708248c2 100644
--- a/src/Client/Adapter/Curl.php
+++ b/src/Client/Adapter/Curl.php
@@ -431,13 +431,13 @@ public function write($method, $uri, $httpVersion = 1.1, $headers = [], $body =
 
         // cURL automatically decodes chunked-messages, this means we have to
         // disallow the Zend\Http\Response to do it again.
-        $responseHeaders = preg_replace("/Transfer-Encoding:\s*chunked\\r\\n/", "", $responseHeaders);
+        $responseHeaders = preg_replace("/Transfer-Encoding:\s*chunked\\r\\n/i", "", $responseHeaders);
 
         // cURL can automatically handle content encoding; prevent double-decoding from occurring
         if (isset($this->config['curloptions'][CURLOPT_ENCODING])
             && '' == $this->config['curloptions'][CURLOPT_ENCODING]
         ) {
-            $responseHeaders = preg_replace("/Content-Encoding:\s*gzip\\r\\n/", '', $responseHeaders);
+            $responseHeaders = preg_replace("/Content-Encoding:\s*gzip\\r\\n/i", '', $responseHeaders);
         }
 
         // cURL automatically handles Proxy rewrites, remove the "HTTP/1.0 200 Connection established" string: