diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 62e7aee..3d493f6 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -3,7 +3,8 @@ Changelog
 
 Unreleased
 ------------------
-#. Add Wagtail 2.0 compatibility
+#. Add Wagtail 2.0 compatibility.
+#. Ensure captcha field is properly removed from submission data. (issue #11)
 
 0.2 (2016-10-16)
 ------------------
diff --git a/tests/test_models.py b/tests/test_models.py
index 1dcb6bf..7e54896 100644
--- a/tests/test_models.py
+++ b/tests/test_models.py
@@ -1,20 +1,67 @@
 from __future__ import absolute_import, unicode_literals
 
+import json
+
 from django.test import TestCase
 
 from home.models import TestCaptchaEmailFormPage, TestCaptchaFormPage
 from wagtailcaptcha.forms import WagtailCaptchaFormBuilder
 
+try:
+    from test.test_support import EnvironmentVarGuard  # Python 2
+except ImportError:
+    from test.support import EnvironmentVarGuard  # Python 3
+
+
+class CaptchaTestingModeMixin(TestCase):
+    """Allow Captcha to pass regardless of the value provided"""
+
+    def setUp(self):
+        self.captcha_testing_mode_env = EnvironmentVarGuard()
+        self.captcha_testing_mode_env.set('RECAPTCHA_TESTING', 'True')
+
+        self.captcha_form_data = {'recaptcha_response_field': 'PASSED'}
+
+
+class TestCaptchaEmailFormPageTestCase(CaptchaTestingModeMixin, TestCase):
+    fixtures = ['test_data.json']
 
-class TestCaptchaEmailFormPageTestCase(TestCase):
     def test_captcha_form_builder_is_set(self):
         page = TestCaptchaEmailFormPage()
 
         self.assertIs(page.form_builder, WagtailCaptchaFormBuilder)
 
+    def test_captcha_field_is_removed_from_submission_data(self):
+        page = TestCaptchaEmailFormPage.objects.get(slug='email-form')
+        form_data = dict(self.captcha_form_data, name='Robert')
+        form = page.get_form(form_data)
+
+        with self.captcha_testing_mode_env:
+            self.assertTrue(form.is_valid())
+
+        form_submission = page.process_form_submission(form)
+        submission_data = json.loads(form_submission.form_data)
+
+        self.assertNotIn(WagtailCaptchaFormBuilder.CAPTCHA_FIELD_NAME, submission_data)
+
+
+class TestCaptchaFormPageTestCase(CaptchaTestingModeMixin, TestCase):
+    fixtures = ['test_data.json']
 
-class TestCaptchaFormPageTestCase(TestCase):
     def test_captcha_form_builder_is_set(self):
         page = TestCaptchaFormPage()
 
         self.assertIs(page.form_builder, WagtailCaptchaFormBuilder)
+
+    def test_captcha_field_is_removed_from_submission_data(self):
+        page = TestCaptchaFormPage.objects.get(slug='form')
+        form_data = dict(self.captcha_form_data, name='Robert')
+        form = page.get_form(form_data)
+
+        with self.captcha_testing_mode_env:
+            self.assertTrue(form.is_valid())
+
+        form_submission = page.process_form_submission(form)
+        submission_data = json.loads(form_submission.form_data)
+
+        self.assertNotIn(WagtailCaptchaFormBuilder.CAPTCHA_FIELD_NAME, submission_data)
diff --git a/tests/testapp/home/fixtures/test_data.json b/tests/testapp/home/fixtures/test_data.json
index f199733..7ed1a29 100644
--- a/tests/testapp/home/fixtures/test_data.json
+++ b/tests/testapp/home/fixtures/test_data.json
@@ -129,14 +129,14 @@
         "numchild": 0,
         "title": "Form",
         "draft_title": "Form",
-        "slug": "contact",
+        "slug": "form",
         "content_type": [
             "home",
             "testcaptchaformpage"
         ],
         "live": true,
         "has_unpublished_changes": false,
-        "url_path": "/home/contact/",
+        "url_path": "/home/form/",
         "owner": [
             "admin"
         ],
diff --git a/wagtailcaptcha/forms.py b/wagtailcaptcha/forms.py
index 9cae4ef..ccd0354 100644
--- a/wagtailcaptcha/forms.py
+++ b/wagtailcaptcha/forms.py
@@ -19,3 +19,8 @@ def formfields(self):
         fields[self.CAPTCHA_FIELD_NAME] = ReCaptchaField(label='')
 
         return fields
+
+
+def remove_captcha_field(form):
+    form.fields.pop(WagtailCaptchaFormBuilder.CAPTCHA_FIELD_NAME, None)
+    form.cleaned_data.pop(WagtailCaptchaFormBuilder.CAPTCHA_FIELD_NAME, None)
diff --git a/wagtailcaptcha/models.py b/wagtailcaptcha/models.py
index 798897f..cc8140d 100644
--- a/wagtailcaptcha/models.py
+++ b/wagtailcaptcha/models.py
@@ -1,7 +1,7 @@
 from __future__ import absolute_import, unicode_literals
 
 import wagtail
-from .forms import WagtailCaptchaFormBuilder
+from .forms import WagtailCaptchaFormBuilder, remove_captcha_field
 
 if wagtail.VERSION >= (2, 0):
     from wagtail.contrib.forms.models import AbstractEmailForm, AbstractForm
@@ -17,8 +17,7 @@ def __init__(self, *args, **kwargs):
         self.form_builder = WagtailCaptchaFormBuilder
 
     def process_form_submission(self, form):
-        if WagtailCaptchaFormBuilder.CAPTCHA_FIELD_NAME in form.fields:
-            form.fields.pop(WagtailCaptchaFormBuilder.CAPTCHA_FIELD_NAME)
+        remove_captcha_field(form)
         return super(WagtailCaptchaEmailForm, self).process_form_submission(form)
 
     class Meta:
@@ -32,5 +31,9 @@ def __init__(self, *args, **kwargs):
         super(WagtailCaptchaForm, self).__init__(*args, **kwargs)
         self.form_builder = WagtailCaptchaFormBuilder
 
+    def process_form_submission(self, form):
+        remove_captcha_field(form)
+        return super(WagtailCaptchaForm, self).process_form_submission(form)
+
     class Meta:
         abstract = True