diff --git a/lib/HttpClient/CurlClient.php b/lib/HttpClient/CurlClient.php
index 13db222f6..aed0e9122 100644
--- a/lib/HttpClient/CurlClient.php
+++ b/lib/HttpClient/CurlClient.php
@@ -22,8 +22,8 @@
 }
 // @codingStandardsIgnoreEnd
 
-if (!defined('CURL_HTTP_VERSION_2_0')) {
-    define('CURL_HTTP_VERSION_2_0', 3);
+if (!defined('CURL_HTTP_VERSION_2TLS')) {
+    define('CURL_HTTP_VERSION_2TLS', 4);
 }
 
 class CurlClient implements ClientInterface
@@ -197,8 +197,8 @@ public function request($method, $absUrl, $headers, $params, $hasFile)
             $opts[CURLOPT_SSL_VERIFYPEER] = false;
         }
 
-        // Enable HTTP/2, if supported
-        $opts[CURLOPT_HTTP_VERSION] = CURL_HTTP_VERSION_2_0;
+        // For HTTPS requests, enable HTTP/2, if supported
+        $opts[CURLOPT_HTTP_VERSION] = CURL_HTTP_VERSION_2TLS;
 
         list($rbody, $rcode) = $this->executeRequestWithRetries($opts, $absUrl);