diff --git a/lib/form/form.js b/lib/form/form.js
index ee473ebe5cf..938fab6be66 100644
--- a/lib/form/form.js
+++ b/lib/form/form.js
@@ -237,6 +237,10 @@ M.form.initFormDependencies = function(Y, formid, dependencies) {
             _dependency_notchecked : function(elements, value) {
                 var lock = false;
                 elements.each(function(){
+                    if (this.getAttribute('type').toLowerCase()=='hidden' && !this.siblings('input[type=checkbox][name="' + this.get('name') + '"]').isEmpty()) {
+                        // This is the hidden input that is part of an advcheckbox.
+                        return;
+                    }
                     if (this.getAttribute('type').toLowerCase()=='radio' && this.get('value') != value) {
                         return;
                     }
@@ -250,6 +254,10 @@ M.form.initFormDependencies = function(Y, formid, dependencies) {
             _dependency_checked : function(elements, value) {
                 var lock = false;
                 elements.each(function(){
+                    if (this.getAttribute('type').toLowerCase()=='hidden' && !this.siblings('input[type=checkbox][name="' + this.get('name') + '"]').isEmpty()) {
+                        // This is the hidden input that is part of an advcheckbox.
+                        return;
+                    }
                     if (this.getAttribute('type').toLowerCase()=='radio' && this.get('value') != value) {
                         return;
                     }
@@ -272,10 +280,16 @@ M.form.initFormDependencies = function(Y, formid, dependencies) {
             },
             _dependency_eq : function(elements, value) {
                 var lock = false;
+                var hidden_val = false;
                 elements.each(function(){
                     if (this.getAttribute('type').toLowerCase()=='radio' && !Y.Node.getDOMNode(this).checked) {
                         return;
+                    } else if (this.getAttribute('type').toLowerCase() == 'hidden' && !this.siblings('input[type=checkbox][name="' + this.get('name') + '"]').isEmpty()) {
+                        // This is the hidden input that is part of an advcheckbox.
+                        hidden_val = (this.get('value') == value);
+                        return;
                     } else if (this.getAttribute('type').toLowerCase() == 'checkbox' && !Y.Node.getDOMNode(this).checked) {
+                        lock = lock || hidden_val;
                         return;
                     }
                     //check for filepicker status
@@ -303,10 +317,16 @@ M.form.initFormDependencies = function(Y, formid, dependencies) {
             },
             _dependency_default : function(elements, value, ev) {
                 var lock = false;
+                var hidden_val = false;
                 elements.each(function(){
                     if (this.getAttribute('type').toLowerCase()=='radio' && !Y.Node.getDOMNode(this).checked) {
                         return;
+                    } else if (this.getAttribute('type').toLowerCase() == 'hidden' && !this.siblings('input[type=checkbox][name="' + this.get('name') + '"]').isEmpty()) {
+                        // This is the hidden input that is part of an advcheckbox.
+                        hidden_val = (this.get('value') != value);
+                        return;
                     } else if (this.getAttribute('type').toLowerCase() == 'checkbox' && !Y.Node.getDOMNode(this).checked) {
+                        lock = lock || hidden_val;
                         return;
                     }
                     //check for filepicker status
diff --git a/lib/formslib.php b/lib/formslib.php
index f02469e91b8..d82f9c139be 100644
--- a/lib/formslib.php
+++ b/lib/formslib.php
@@ -1970,7 +1970,11 @@ function validate_' . $this->_formName . '(frm) {
         } else if (is_a($element, 'HTML_QuickForm_hidden')) {
             return array();
 
-        } else if (method_exists($element, 'getPrivateName')) {
+        } else if (method_exists($element, 'getPrivateName') &&
+                !($element instanceof HTML_QuickForm_advcheckbox)) {
+            // The advcheckbox element implements a method called getPrivateName,
+            // but in a way that is not compatible with the generic API, so we
+            // have to explicitly exclude it.
             return array($element->getPrivateName());
 
         } else {