diff --git a/inc/SP/Http/Request.class.php b/inc/SP/Http/Request.class.php
index d79cbcdd..1b8bbd7b 100644
--- a/inc/SP/Http/Request.class.php
+++ b/inc/SP/Http/Request.class.php
@@ -164,7 +164,7 @@ class Request
      */
     public static function getApacheHeaders()
     {
-        if (!function_exists('\apache_request_headers')) {
+        if (function_exists('\apache_request_headers')) {
             return apache_request_headers();
         }