diff --git a/plugins/custom_forms/lib/custom_forms_plugin/form.rb b/plugins/custom_forms/lib/custom_forms_plugin/form.rb
index a3f1154..9426f97 100644
--- a/plugins/custom_forms/lib/custom_forms_plugin/form.rb
+++ b/plugins/custom_forms/lib/custom_forms_plugin/form.rb
@@ -17,6 +17,11 @@ class CustomFormsPlugin::Form < Noosfero::Plugin::ActiveRecord
     form.access = nil if form.access.blank?
   end
 
+  after_destroy do |form|
+    tasks = CustomFormsPlugin::MembershipSurvey.from(form.profile).opened.select { |t| t.form_id == form.id }
+    tasks.each {|task| task.cancel}
+  end
+
   named_scope :from, lambda {|profile| {:conditions => {:profile_id => profile.id}}}
   named_scope :on_memberships, {:conditions => {:on_membership => true, :for_admission => false}}
   named_scope :for_admissions, {:conditions => {:for_admission => true}}
diff --git a/plugins/custom_forms/test/unit/custom_forms_plugin/form_test.rb b/plugins/custom_forms/test/unit/custom_forms_plugin/form_test.rb
index 6acecd4..f56a29e 100644
--- a/plugins/custom_forms/test/unit/custom_forms_plugin/form_test.rb
+++ b/plugins/custom_forms/test/unit/custom_forms_plugin/form_test.rb
@@ -211,4 +211,23 @@ class CustomFormsPlugin::FormTest < ActiveSupport::TestCase
     assert_includes scope, f1
     assert_not_includes scope, f2
   end
+
+  should 'cancel survey tasks after removing a form' do
+    profile = fast_create(Profile)
+    person = fast_create(Person)
+
+    form1 = CustomFormsPlugin::Form.create!(:name => 'Free Software', :profile => profile)
+    form2 = CustomFormsPlugin::Form.create!(:name => 'Operation System', :profile => profile)
+
+    task1 = CustomFormsPlugin::MembershipSurvey.create!(:form_id => form1.id, :target => person, :requestor => profile)
+    task2 = CustomFormsPlugin::MembershipSurvey.create!(:form_id => form2.id, :target => person, :requestor => profile)
+
+    assert_includes Task.opened, task1
+    assert_includes Task.opened, task2
+    form1.destroy
+    assert_includes Task.canceled, task1
+    assert_includes Task.opened, task2
+    form2.destroy
+    assert_includes Task.canceled, task2
+  end
 end
--
libgit2 0.21.2