diff --git a/multiple-select.js b/multiple-select.js
index ea997187..0f6ca957 100644
--- a/multiple-select.js
+++ b/multiple-select.js
@@ -367,7 +367,9 @@
             });
             this.$selectGroups.off('click').on('click', function () {
                 var group = $(this).parent().attr('data-group'),
-                    $items = that.$selectItems.filter(':visible'),
+                    $items = that.options.multipleSelectFilteredOnly
+                               ? that.$selectItems.filter(':visible')
+                               : that.$selectItems,
                     $children = $items.filter(sprintf('[data-group="%s"]', group)),
                     checked = $children.length !== $children.filter(':checked').length;
 
@@ -525,7 +527,9 @@
         },
 
         updateOptGroupSelect: function () {
-            var $items = this.$selectItems.filter(':visible');
+            var $items = this.options.multipleSelectFilteredOnly
+                             ? this.$selectItems.filter(':visible')
+                             : this.$selectItems;
             $.each(this.$selectGroups, function (i, val) {
                 var group = $(val).parent().attr('data-group'),
                     $children = $items.filter(sprintf('[data-group="%s"]', group));
@@ -735,6 +739,7 @@
         addTitle: false,
         filterAcceptOnEnter: false,
         hideOptgroupCheckboxes: false,
+        multipleSelectFilteredOnly: true,
 
         selectAllText: 'Select all',
         allSelected: 'All selected',