diff --git a/phpBB/assets/javascript/core.js b/phpBB/assets/javascript/core.js
index b42870f466..488b095b47 100644
--- a/phpBB/assets/javascript/core.js
+++ b/phpBB/assets/javascript/core.js
@@ -338,7 +338,7 @@ phpbb.ajaxify = function(options) {
 		{
 			action = $this.attr('action').replace('&', '&');
 			data = $this.serializeArray();
-			method = $this.attr('method');
+			method = $this.attr('method') || 'GET';
 		}
 		else
 		{
@@ -347,7 +347,7 @@ phpbb.ajaxify = function(options) {
 			method = 'GET';
 		}
 
-		// If filter function returns true, cancel the AJAX functionality,
+		// 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))
 		{
diff --git a/phpBB/styles/prosilver/template/ajax.js b/phpBB/styles/prosilver/template/ajax.js
index 4360dc645f..f82da9f70e 100644
--- a/phpBB/styles/prosilver/template/ajax.js
+++ b/phpBB/styles/prosilver/template/ajax.js
@@ -73,25 +73,25 @@ $('[data-ajax]').each(function() {
  */
 phpbb.ajaxify({
 	selector: '#quickmodform',
-	filter: function(data) {
+	refresh: true,
+	filter: function (data) {
 		var action = $('#quick-mod-select').val();
 
 		if (action === 'make_normal')
 		{
-			return !($(this).find('select option[value="make_global"]').length);
+			return $(this).find('select option[value="make_global"]').length > 0;
 		}
 		else if (action === 'lock' || action === 'unlock')
 		{
-			return false;
+			return true;
 		}
 
 		if (action === 'delete_topic' || action === 'make_sticky' || action === 'make_announce' || action === 'make_global') {
-			return false;
+			return true;
 		}
 
-		return true;
-	},
-	refresh: true
+		return false;
+	}
 });