diff --git a/src/UrlInfo/UrlInfo.php b/src/UrlInfo/UrlInfo.php
index f036650..78fa83f 100644
--- a/src/UrlInfo/UrlInfo.php
+++ b/src/UrlInfo/UrlInfo.php
@@ -390,7 +390,7 @@ class UrlInfo {
      * @return string The URL arguments as a string
      */
     public function getArgumentsAsString (int $encoding_type = PHP_QUERY_RFC1738): string {
-        return http_build_query($this->getArguments()->toArray(), '', null, $encoding_type);
+        return http_build_query($this->getArguments()->toArray(), '', '&', $encoding_type);
     }
     /**
      * Set the URL arguments