diff --git a/src/Elasticsearch/Connections/Connection.php b/src/Elasticsearch/Connections/Connection.php
index c1d174666..6f2e6488d 100644
--- a/src/Elasticsearch/Connections/Connection.php
+++ b/src/Elasticsearch/Connections/Connection.php
@@ -294,6 +294,14 @@ private function wrapHandler(callable $handler, LoggerInterface $logger, LoggerI
     private function getURI($uri, $params)
     {
         if (isset($params) === true && !empty($params)) {
+            array_walk($params, function (&$value, &$key) {
+                if ($value === true) {
+                    $value = 'true';
+                } else if ($value === false) {
+                    $value = 'false';
+                }
+            });
+
             $uri .= '?' . http_build_query($params);
         }