diff --git a/plugins/GeonamesPlugin.php b/plugins/GeonamesPlugin.php
index 0d12c1cf70..df99c7849b 100644
--- a/plugins/GeonamesPlugin.php
+++ b/plugins/GeonamesPlugin.php
@@ -448,7 +448,7 @@ class GeonamesPlugin extends Plugin
             $params['token'] = $this->token;
         }
 
-        $str = http_build_query($params);
+        $str = http_build_query($params, null, '&');
 
         return 'http://'.$this->host.'/'.$method.'?'.$str;
     }