diff --git a/phpBB/assets/javascript/core.js b/phpBB/assets/javascript/core.js
index bed25b5beb..c41edfa145 100644
--- a/phpBB/assets/javascript/core.js
+++ b/phpBB/assets/javascript/core.js
@@ -248,8 +248,8 @@ phpbb.ajaxify = function(options) {
 		is_form = elements.is('form'),
 		event_name = is_form ? 'submit' : 'click';
 
-	elements.bind(event_name, function() {
-		var action, method, data, that = this, $this = $(this);
+	elements.bind(event_name, function(event) {
+		var action, method, data, submit, that = this, $this = $(this);
 
 		if ($this.find('input[type="submit"][data-clicked]').attr('data-ajax') === 'false')
 		{
@@ -361,7 +361,7 @@ phpbb.ajaxify = function(options) {
 
 			if ($this.find('input[type="submit"][data-clicked]'))
 			{
-				var submit = $this.find('input[type="submit"][data-clicked]');
+				submit = $this.find('input[type="submit"][data-clicked]');
 				data.push({
 					name: submit.attr('name'),
 					value: submit.val()
@@ -379,7 +379,7 @@ phpbb.ajaxify = function(options) {
 		// and return true (meaning that the HTTP request will be sent normally).
 		if (run_filter && !options.filter.call(this, data))
 		{
-			return true;
+			return;
 		}
 
 		phpbb.loading_alert();
@@ -392,7 +392,7 @@ phpbb.ajaxify = function(options) {
 			error: error_handler
 		});
 
-		return false;
+		event.preventDefault();
 	});
 
 	if (is_form) {