diff --git a/lib/modules/database.js b/lib/modules/database.js
index f7f91fe..b87d429 100644
--- a/lib/modules/database.js
+++ b/lib/modules/database.js
@@ -113,7 +113,7 @@ class DatabaseQuery {
       .forEach(key => {
         const filter = this.filters[key];
         if (filter) {
-          const filterArgs = [key, filter].join(argsSeparator)
+          const filterArgs = ([key].concat(filter)).join(argsSeparator)
           modifiers.push(filterArgs);
         }
       })