diff --git a/app/code/community/ProxiBlue/ReCaptcha/Model/Observer.php b/app/code/community/ProxiBlue/ReCaptcha/Model/Observer.php
index cd184c7..96ab96b 100644
--- a/app/code/community/ProxiBlue/ReCaptcha/Model/Observer.php
+++ b/app/code/community/ProxiBlue/ReCaptcha/Model/Observer.php
@@ -192,5 +192,41 @@ public function newsletterSubscriber($observer)
         return $this;
     }
 
+    /**
+     * Check Captcha On Checkout Register Page
+     *
+     * @param Varien_Event_Observer $observer
+     * @return $this
+     */
+    public function checkCheckout($observer)
+    {
+        $checkoutMethod = Mage::getSingleton('checkout/type_onepage')->getQuote()->getCheckoutMethod();
+        if ($checkoutMethod == Mage_Checkout_Model_Type_Onepage::METHOD_REGISTER) {
+            $formId = 'register_during_checkout';
+            $captchaModel = Mage::helper('captcha')->getCaptcha($formId);
+            if ($captchaModel->isRequired()) {
+                $controller = $observer->getControllerAction();
+                if (!$captchaModel->isCorrect($this->_getCaptchaString($controller->getRequest(), $formId))) {
+                    $controller->setFlag('', Mage_Core_Controller_Varien_Action::FLAG_NO_DISPATCH, true);
+                    $result = array('error' => 1, 'message' => Mage::helper('captcha')->__('Incorrect CAPTCHA.'));
+                    $controller->getResponse()->setBody(Mage::helper('core')->jsonEncode($result));
+                }
+            }
+        }
+        if ($checkoutMethod == Mage_Checkout_Model_Type_Onepage::METHOD_GUEST) {
+            $formId = 'guest_checkout';
+            $captchaModel = Mage::helper('captcha')->getCaptcha($formId);
+            if ($captchaModel->isRequired()) {
+                $controller = $observer->getControllerAction();
+                if (!$captchaModel->isCorrect($this->_getCaptchaString($controller->getRequest(), $formId))) {
+                    $controller->setFlag('', Mage_Core_Controller_Varien_Action::FLAG_NO_DISPATCH, true);
+                    $result = array('error' => 1, 'message' => Mage::helper('captcha')->__('Incorrect CAPTCHA.'));
+                    $controller->getResponse()->setBody(Mage::helper('core')->jsonEncode($result));
+                }
+            }
+        }
+        return $this;
+    }
+
 
 }
diff --git a/app/code/community/ProxiBlue/ReCaptcha/Model/Recaptcha.php b/app/code/community/ProxiBlue/ReCaptcha/Model/Recaptcha.php
index d24be23..dcc573c 100755
--- a/app/code/community/ProxiBlue/ReCaptcha/Model/Recaptcha.php
+++ b/app/code/community/ProxiBlue/ReCaptcha/Model/Recaptcha.php
@@ -194,6 +194,9 @@ public function getElementId($type = 'input')
     public function isRequired($login = null)
     {
         if(!$this->_isEnabled() || !in_array($this->_formId, $this->_getTargetForms())){
+            if($this->_formId == 'recapctha_checkout') {
+                return true;
+            }
             return false;
         }
 
@@ -208,4 +211,35 @@ private function _debug($message) {
             Mage::log($message, null, 'recapctha.log');
         }
     }
+
+    /**
+     * Retrieve list of forms where captcha must be shown
+     *
+     * For frontend this list is based on current website
+     *
+     * @return array
+     */
+    protected function _getTargetForms()
+    {
+        $formsString = (string) $this->_getHelper()->getConfigNode('forms');
+        $forms =  explode(',', $formsString);
+        // remove either checkout as guest or register at checkout, and if either is there, replace with a generic checkout
+        if (($key = array_search('register_during_checkout', $forms)) !== false) {
+            unset($forms[$key]);
+            if (Mage::registry('has_recapctha') == false && $this->_formId == 'register_during_checkout') {
+                $forms[] = 'recapctha_checkout';
+                $this->_formId = 'recapctha_checkout';
+                Mage::register('has_recapctha', true, true);
+            }
+        }
+        if (($key = array_search('guest_checkout', $forms)) !== false) {
+            unset($forms[$key]);
+            if (Mage::registry('has_recapctha') == false && $this->_formId == 'guest_checkout') {
+                $forms[] = 'recapctha_checkout';
+                $this->_formId = 'recapctha_checkout';
+                Mage::register('has_recapctha', true, true);
+            }
+        }
+        return array_unique($forms);
+    }
 }
diff --git a/app/code/community/ProxiBlue/ReCaptcha/etc/config.xml b/app/code/community/ProxiBlue/ReCaptcha/etc/config.xml
index 7fa3de5..3ecf3fe 100755
--- a/app/code/community/ProxiBlue/ReCaptcha/etc/config.xml
+++ b/app/code/community/ProxiBlue/ReCaptcha/etc/config.xml
@@ -2,7 +2,7 @@
 <config>
     <modules>
         <ProxiBlue_ReCaptcha>
-            <version>2.3.4</version>
+            <version>2.3.7</version>
             <depends>
                 <Mage_Captcha/>
             </depends>
@@ -54,6 +54,14 @@
                     </captcha>
                 </observers>
             </controller_action_predispatch_newsletter_subscriber_new>
+            <controller_action_predispatch_checkout_onepage_savebilling>
+                <observers>
+                    <captcha_guest>
+                        <class>proxiblue_recaptcha/observer</class>
+                        <method>checkCheckout</method>
+                    </captcha_guest>
+                </observers>
+            </controller_action_predispatch_checkout_onepage_savebilling>
         </events>
     </global>
     <adminhtml>
diff --git a/composer.json b/composer.json
index 7514ece..5fc519d 100644
--- a/composer.json
+++ b/composer.json
@@ -4,7 +4,7 @@
   "license": "OSL-3.0",
   "homepage": "https://github.com/ProxiBlue/reCaptcha",
   "description": "Clean integration of Google reCaptcha to OpenMage",
-  "version": "2.3.6",
+  "version": "2.3.7",
   "authors": [
     {
       "name": "Lucas van Staden",