diff --git a/Curl.class.php b/Curl.class.php
index fcf4a06..1075af3 100644
--- a/Curl.class.php
+++ b/Curl.class.php
@@ -114,7 +114,7 @@ class Curl {
                 $query[] = urlencode(is_null($key) ? $k : $key . $brackets) . '=' . rawurlencode($value);
             }
             else if (is_array($value)) {
-                $nested = (is_null($key)) ? $k : $key."[".$k."]";
+                $nested = (is_null($key)) ? $k : $key . '[' . $k . ']';
                 $query[] = $this->http_build_multi_query($value, $nested);
             }
         }