diff --git a/core/misc/ajax.js b/core/misc/ajax.js
index 2a6616d..8202f50 100644
--- a/core/misc/ajax.js
+++ b/core/misc/ajax.js
@@ -26,7 +26,7 @@
       function loadAjaxBehavior(base) {
         var element_settings = settings.ajax[base];
         if (typeof element_settings.selector === 'undefined') {
-          element_settings.selector = '#' + base;
+          element_settings.selector = '[id="' + base + '"]';
         }
         $(element_settings.selector).once('drupal-ajax').each(function () {
           element_settings.element = this;