diff --git a/lib/mapstory/MapConfig.js b/lib/mapstory/MapConfig.js
index cc932f7..30e0478 100644
--- a/lib/mapstory/MapConfig.js
+++ b/lib/mapstory/MapConfig.js
@@ -37,6 +37,7 @@ exports.MapConfig = function() {
                                 for (var key in params) {
                                     if (angular.isArray(params[key])) {
                                         params[key.toUpperCase()] = params[key].join(',');
+                                        delete params[key];
                                     }
                                 }
                                 layerConfig.url = layer.args[1];