diff --git a/plone/app/discussion/browser/captcha.py b/plone/app/discussion/browser/captcha.py
index 05c20ee..3d3de3c 100644
--- a/plone/app/discussion/browser/captcha.py
+++ b/plone/app/discussion/browser/captcha.py
@@ -18,7 +18,7 @@ from plone.z3cform.fieldsets.interfaces import IFormExtender
 
 from plone.app.discussion.browser.comments import CommentForm
 from plone.app.discussion.comment import Comment
-from plone.app.discussion.interfaces import IDiscussionSettings
+from plone.app.discussion.interfaces import IDiscussionSettings, ICaptcha
 
 try:
     from plone.formwidget.captcha import CaptchaFieldWidget
@@ -30,22 +30,19 @@ try:
 except ImportError:
     pass
 
-
-class ICaptcha(Interface):
-    captcha = schema.TextLine(title=u"Captcha",
-                              required=True)
-
 class Captcha(Persistent):
     interface.implements(ICaptcha)
     adapts(Comment)
     captcha = u""
 
 Captcha = factory(Captcha)
-provideAdapter(Captcha)
 
 class CaptchaExtender(extensible.FormExtender):
     adapts(Interface, IDefaultBrowserLayer, CommentForm) # context, request, form
 
+    fields = Fields(ICaptcha)
+    fields['captcha'].widgetFactory = CaptchaFieldWidget
+
     def __init__(self, context, request, form):
         self.context = context
         self.request = request
@@ -62,4 +59,9 @@ class CaptchaExtender(extensible.FormExtender):
             if self.captcha == 'captcha':
                 self.form.fields['captcha'].widgetFactory = CaptchaFieldWidget
             elif self.captcha == 'recaptcha':
-                self.form.fields['captcha'].widgetFactory = ReCaptchaFieldWidget
\ No newline at end of file
+                self.form.fields['captcha'].widgetFactory = ReCaptchaFieldWidget
+
+from z3c.form import validator
+from plone.formwidget.captcha.validator import CaptchaValidator
+# Register Captcha validator for the captcha field in the ICaptchaForm
+validator.WidgetValidatorDiscriminators(CaptchaValidator, field=ICaptcha['captcha'])
\ No newline at end of file
diff --git a/plone/app/discussion/browser/comments.py b/plone/app/discussion/browser/comments.py
index d4e0d47..fedcee9 100644
--- a/plone/app/discussion/browser/comments.py
+++ b/plone/app/discussion/browser/comments.py
@@ -77,6 +77,17 @@ class CommentForm(extensible.ExtensibleForm, form.Form):
     def handleComment(self, action):
         data, errors = self.extractData()
 
+        if data.has_key('captcha'):
+            from plone.formwidget.captcha.validator import CaptchaValidator
+            from plone.app.discussion.interfaces import ICaptcha
+            # Verify the user input against the captcha
+            captcha = CaptchaValidator(self.context, self.request, None, ICaptcha['captcha'], None)
+            if data.has_key('subject') and captcha.validate(data['captcha']):
+                # if captcha validation passes, print the subject
+                print data['subject']
+        else:
+            return
+
         if data.has_key('title') and data.has_key('text'):
 
             title = data['title']
diff --git a/plone/app/discussion/browser/configure.zcml b/plone/app/discussion/browser/configure.zcml
index 0d35e35..e83b4b7 100644
--- a/plone/app/discussion/browser/configure.zcml
+++ b/plone/app/discussion/browser/configure.zcml
@@ -66,12 +66,18 @@
 
     <!-- Comment form extender -->
     <adapter
-        factory=".captcha.Captcha" />
+        factory=".captcha.Captcha"
+        provides="plone.app.discussion.interfaces.ICaptcha" />
 
     <adapter
         factory=".captcha.CaptchaExtender"
         provides="plone.z3cform.fieldsets.interfaces.IFormExtender" />
 
+    <!-- Captcha validator -->
+    <adapter
+        factory=".captcha.CaptchaValidator"
+        />
+
     <!-- Comment view -->
     <browser:view
         name="view"
diff --git a/plone/app/discussion/interfaces.py b/plone/app/discussion/interfaces.py
index b87bfd9..3605c83 100644
--- a/plone/app/discussion/interfaces.py
+++ b/plone/app/discussion/interfaces.py
@@ -163,6 +163,10 @@ class IComment(Interface):
     creation_date = schema.Date(title=_(u"Creation date"))
     modification_date = schema.Date(title=_(u"Modification date"))
 
+class ICaptcha(Interface):
+    captcha = schema.TextLine(title=u"Captcha",
+                              required=True)
+
 class ICommentingTool(Interface):
     """A tool that indexes all comments for usage by the management interface.