diff --git misc/ajax.js misc/ajax.js
index 8e3a1ab..a8ffb0c 100644
--- misc/ajax.js
+++ misc/ajax.js
@@ -224,7 +224,7 @@ Drupal.ajax.prototype.beforeSubmit = function (form_values, element, options) {
     $(this.element).after(this.progress.element);
   }
   else if (this.progress.type == 'throbber') {
-    this.progress.element = $('<div class="ajax-progress ajax-progress-throbber"><div class="throbber">&nbsp;</div></div>');
+    this.progress.element = $('<div class="ajax-progress ajax-progress-throbber clearfix"><div class="throbber">&nbsp;</div></div>');
     if (this.progress.message) {
       $('.throbber', this.progress.element).after('<div class="message">' + this.progress.message + '</div>');
     }
diff --git modules/system/system-behavior.css modules/system/system-behavior.css
index 66e71a8..4158fbc 100644
--- modules/system/system-behavior.css
+++ modules/system/system-behavior.css
@@ -166,6 +166,9 @@ div.tree-child-horizontal {
   background: transparent url(../../misc/throbber.gif) no-repeat 0px -18px;
   float: left; /* LTR */
 }
+.ajax-progress-throbber {
+	float: none;
+}
 tr .ajax-progress .throbber {
   margin: 0 2px;
 }