diff --git a/actions/oauthconnectionssettings.php b/actions/oauthconnectionssettings.php
index 99bb9022b2..b17729b821 100644
--- a/actions/oauthconnectionssettings.php
+++ b/actions/oauthconnectionssettings.php
@@ -50,10 +50,12 @@ class OauthconnectionssettingsAction extends ConnectSettingsAction
 {
 
     var $page = null;
+    var $id   = null;
 
     function prepare($args)
     {
         parent::prepare($args);
+        $this->id = (int)$this->arg('id');
         $this->page = ($this->arg('page')) ? ($this->arg('page') + 0) : 1;
         return true;
     }
@@ -101,16 +103,16 @@ class OauthconnectionssettingsAction extends ConnectSettingsAction
 
         $application = $profile->getApplications($offset, $limit);
 
-	$cnt == 0;
+        $cnt == 0;
 
-	if (!empty($application)) {
-	    $al = new ApplicationList($application, $user, $this, true);
-	    $cnt = $al->show();
-	}
+        if (!empty($application)) {
+            $al = new ApplicationList($application, $user, $this, true);
+            $cnt = $al->show();
+        }
 
-	if ($cnt == 0) {
-	    $this->showEmptyListMessage();
-	}
+        if ($cnt == 0) {
+            $this->showEmptyListMessage();
+        }
 
         $this->pagination($this->page > 1, $cnt > APPS_PER_PAGE,
                           $this->page, 'connectionssettings',
@@ -139,6 +141,50 @@ class OauthconnectionssettingsAction extends ConnectSettingsAction
             return;
         }
 
+        if ($this->arg('revoke')) {
+            $this->revokeAccess($this->id);
+
+            // XXX: Show some indicator to the user of what's been done.
+
+            $this->showPage();
+        } else {
+            $this->clientError(_('Unexpected form submission.'), 401);
+            return false;
+        }
+    }
+
+    function revokeAccess($appId)
+    {
+        $cur = common_current_user();
+
+        $app = Oauth_application::staticGet('id', $appId);
+
+        if (empty($app)) {
+            $this->clientError(_('No such application.'), 404);
+            return false;
+        }
+
+        $appUser = Oauth_application_user::getByKeys($cur, $app);
+
+        if (empty($appUser)) {
+            $this->clientError(_('You are not a user of that application.'), 401);
+            return false;
+        }
+
+        $orig = clone($appUser);
+        $appUser->access_type = 0;  // No access
+        $result = $appUser->update();
+
+        if (!$result) {
+            common_log_db_error($orig, 'UPDATE', __FILE__);
+            $this->clientError(_('Unable to revoke access for app: ' . $app->id));
+            return false;
+        }
+
+        $msg = 'User %s (id: %d) revoked access to app %s (id: %d)';
+        common_log(LOG_INFO, sprintf($msg, $cur->nickname,
+                                     $cur->id, $app->name, $app->id));
+
     }
 
     function showEmptyListMessage()
diff --git a/actions/showapplication.php b/actions/showapplication.php
index b21b994aa2..049206375d 100644
--- a/actions/showapplication.php
+++ b/actions/showapplication.php
@@ -92,6 +92,7 @@ class ShowApplicationAction extends OwnerDesignAction
 
         if ($cur->id != $this->owner->id) {
             $this->clientError(_('You are not the owner of this application.'), 401);
+            return false;
         }
 
         return true;
diff --git a/classes/Oauth_application_user.php b/classes/Oauth_application_user.php
index a05371f563..618d68133c 100644
--- a/classes/Oauth_application_user.php
+++ b/classes/Oauth_application_user.php
@@ -34,7 +34,7 @@ class Oauth_application_user extends Memcached_DataObject
         $oau = new Oauth_application_user();
 
         $oau->profile_id     = $user->id;
-	$oau->application_id = $app->id;
+        $oau->application_id = $app->id;
         $oau->limit(1);
 
         $result = $oau->find(true);
diff --git a/classes/Profile.php b/classes/Profile.php
index fef2a21710..1076fb2cb3 100644
--- a/classes/Profile.php
+++ b/classes/Profile.php
@@ -358,7 +358,8 @@ class Profile extends Memcached_DataObject
           'SELECT a.* ' .
           'FROM oauth_application_user u, oauth_application a ' .
           'WHERE u.profile_id = %d ' .
-	  'AND a.id = u.application_id ' .
+          'AND a.id = u.application_id ' .
+          'AND u.access_type > 0 ' .
           'ORDER BY u.created DESC ';
 
         if ($offset > 0) {
diff --git a/lib/applicationlist.php b/lib/applicationlist.php
index 6eae261353..3abb1f8aa7 100644
--- a/lib/applicationlist.php
+++ b/lib/applicationlist.php
@@ -142,7 +142,19 @@ class ApplicationList extends Widget
             $this->out->raw($txt);
             $this->out->elementEnd('li');
 
-            // XXX: Add revoke access button
+            $this->out->elementStart('li', 'entity_revoke');
+            $this->out->elementStart('form', array('id' => 'form_revoke_app',
+                                                   'class' => 'form_revoke_app',
+                                                   'method' => 'POST',
+                                                   'action' =>
+                                                   common_local_url('oauthconnectionssettings')));
+            $this->out->elementStart('fieldset');
+            $this->out->hidden('id', $this->application->id);
+            $this->out->hidden('token', common_session_token());
+            $this->out->submit('revoke', _('Revoke'));
+            $this->out->elementEnd('fieldset');
+            $this->out->elementEnd('form');
+            $this->out->elementEnd('li');
         }
     }