diff --git a/phpBB/assets/javascript/core.js b/phpBB/assets/javascript/core.js
index 764bc74bce..eb9798331e 100644
--- a/phpBB/assets/javascript/core.js
+++ b/phpBB/assets/javascript/core.js
@@ -368,7 +368,7 @@ phpbb.ajaxify = function(options) {
 
 		// If filter function returns false, cancel the AJAX functionality,
 		// and return true (meaning that the HTTP request will be sent normally).
-		if (run_filter && options.filter.call(this, data))
+		if (run_filter && !options.filter.call(this, data))
 		{
 			return true;
 		}
diff --git a/phpBB/styles/prosilver/template/viewtopic_body.html b/phpBB/styles/prosilver/template/viewtopic_body.html
index 8559b6fd9e..1c450b0500 100644
--- a/phpBB/styles/prosilver/template/viewtopic_body.html
+++ b/phpBB/styles/prosilver/template/viewtopic_body.html
@@ -263,7 +263,7 @@
 <!-- INCLUDE jumpbox.html -->
 
 <!-- IF .quickmod -->
-	<form method="post" action="{S_MOD_ACTION}" id="quickmodform">
+	<form method="post" action="{S_MOD_ACTION}" id="quickmodform" data-ajax="true">
 	<fieldset class="quickmod">
 		<label for="quick-mod-select">{L_QUICK_MOD}:</label>
 		<select name="action" id="quick-mod-select">