diff --git a/src/js/select2/core.js b/src/js/select2/core.js
index d42c4ead..361dd5c8 100644
--- a/src/js/select2/core.js
+++ b/src/js/select2/core.js
@@ -99,6 +99,7 @@ define([
       id = Utils.generateChars(4);
     }
 
+    id = id.replace(/(:|\.|\[|\]|,)/g, '');
     id = 'select2-' + id;
 
     return id;