diff --git a/src/Wallabag/ApiBundle/Controller/WallabagRestController.php b/src/Wallabag/ApiBundle/Controller/WallabagRestController.php
index a0d9d4f3a..cc6923a04 100644
--- a/src/Wallabag/ApiBundle/Controller/WallabagRestController.php
+++ b/src/Wallabag/ApiBundle/Controller/WallabagRestController.php
@@ -400,6 +400,8 @@ class WallabagRestController extends FOSRestController
             ->getRepository('WallabagCoreBundle:Entry')
             ->removeTag($this->getUser()->getId(), $tag);
 
+        $this->cleanOrphanTag($tag);
+
         $json = $this->get('serializer')->serialize($tag, 'json');
 
         return (new JsonResponse())->setJson($json);
@@ -440,6 +442,8 @@ class WallabagRestController extends FOSRestController
             ->getRepository('WallabagCoreBundle:Entry')
             ->removeTags($this->getUser()->getId(), $tags);
 
+        $this->cleanOrphanTag($tags);
+
         $json = $this->get('serializer')->serialize($tags, 'json');
 
         return (new JsonResponse())->setJson($json);
@@ -464,6 +468,8 @@ class WallabagRestController extends FOSRestController
             ->getRepository('WallabagCoreBundle:Entry')
             ->removeTag($this->getUser()->getId(), $tag);
 
+        $this->cleanOrphanTag($tag);
+
         $json = $this->get('serializer')->serialize($tag, 'json');
 
         return (new JsonResponse())->setJson($json);
@@ -485,6 +491,28 @@ class WallabagRestController extends FOSRestController
         return (new JsonResponse())->setJson($json);
     }
 
+    /**
+     * Remove orphan tag in case no entries are associated to it.
+     *
+     * @param Tag|array $tags
+     */
+    private function cleanOrphanTag($tags)
+    {
+        if (!is_array($tags)) {
+            $tags = [$tags];
+        }
+
+        $em = $this->getDoctrine()->getManager();
+
+        foreach ($tags as $tag) {
+            if (count($tag->getEntries()) === 0) {
+                $em->remove($tag);
+            }
+        }
+
+        $em->flush();
+    }
+
     /**
      * Validate that the first id is equal to the second one.
      * If not, throw exception. It means a user try to access information from an other user.
diff --git a/src/Wallabag/CoreBundle/Controller/TagController.php b/src/Wallabag/CoreBundle/Controller/TagController.php
index 623a61461..c5746734d 100644
--- a/src/Wallabag/CoreBundle/Controller/TagController.php
+++ b/src/Wallabag/CoreBundle/Controller/TagController.php
@@ -63,10 +63,12 @@ class TagController extends Controller
         $entry->removeTag($tag);
         $em = $this->getDoctrine()->getManager();
         $em->flush();
-        if (count($tag->getEntries()) == 0) {
+
+        // remove orphan tag in case no entries are associated to it
+        if (count($tag->getEntries()) === 0) {
             $em->remove($tag);
+            $em->flush();
         }
-        $em->flush();
 
         $redirectUrl = $this->get('wallabag_core.helper.redirect')->to($request->headers->get('referer'));
 
diff --git a/src/Wallabag/CoreBundle/Resources/config/services.yml b/src/Wallabag/CoreBundle/Resources/config/services.yml
index fb97454e7..a4b727f42 100644
--- a/src/Wallabag/CoreBundle/Resources/config/services.yml
+++ b/src/Wallabag/CoreBundle/Resources/config/services.yml
@@ -29,7 +29,7 @@ services:
         arguments:
             - "@doctrine"
 
-    wallabag_core.table_prefix_subscriber:
+    wallabag_core.subscriber.table_prefix:
         class: Wallabag\CoreBundle\Subscriber\TablePrefixSubscriber
         arguments:
             - "%database_table_prefix%"
diff --git a/tests/Wallabag/ApiBundle/Controller/WallabagRestControllerTest.php b/tests/Wallabag/ApiBundle/Controller/WallabagRestControllerTest.php
index 65b65290c..c797daf7a 100644
--- a/tests/Wallabag/ApiBundle/Controller/WallabagRestControllerTest.php
+++ b/tests/Wallabag/ApiBundle/Controller/WallabagRestControllerTest.php
@@ -561,6 +561,8 @@ class WallabagRestControllerTest extends WallabagApiTestCase
      */
     public function testDeleteUserTag($tag)
     {
+        $tagName = $tag['label'];
+
         $this->client->request('DELETE', '/api/tags/'.$tag['id'].'.json');
 
         $this->assertEquals(200, $this->client->getResponse()->getStatusCode());
@@ -577,6 +579,13 @@ class WallabagRestControllerTest extends WallabagApiTestCase
             ->findAllByTagId($this->user->getId(), $tag['id']);
 
         $this->assertCount(0, $entries);
+
+        $tag = $this->client->getContainer()
+            ->get('doctrine.orm.entity_manager')
+            ->getRepository('WallabagCoreBundle:Tag')
+            ->findOneByLabel($tagName);
+
+        $this->assertNull($tag, $tagName.' was removed because it begun an orphan tag');
     }
 
     public function testDeleteTagByLabel()
diff --git a/tests/Wallabag/CoreBundle/Controller/EntryControllerTest.php b/tests/Wallabag/CoreBundle/Controller/EntryControllerTest.php
index d7bf03ba5..9b03a5193 100644
--- a/tests/Wallabag/CoreBundle/Controller/EntryControllerTest.php
+++ b/tests/Wallabag/CoreBundle/Controller/EntryControllerTest.php
@@ -341,22 +341,23 @@ class EntryControllerTest extends WallabagCoreTestCase
         $this->logInAs('admin');
         $client = $this->getClient();
 
-        $content = $client->getContainer()
-            ->get('doctrine.orm.entity_manager')
+        $em = $client->getContainer()
+            ->get('doctrine.orm.entity_manager');
+
+        $content = $em
             ->getRepository('WallabagCoreBundle:Entry')
             ->findByUrlAndUserId($this->url, $this->getLoggedInUserId());
 
         // empty content
         $content->setContent('');
-        $client->getContainer()->get('doctrine.orm.entity_manager')->persist($content);
-        $client->getContainer()->get('doctrine.orm.entity_manager')->flush();
+        $em->persist($content);
+        $em->flush();
 
         $client->request('GET', '/reload/'.$content->getId());
 
         $this->assertEquals(302, $client->getResponse()->getStatusCode());
 
-        $content = $client->getContainer()
-            ->get('doctrine.orm.entity_manager')
+        $content = $em
             ->getRepository('WallabagCoreBundle:Entry')
             ->findByUrlAndUserId($this->url, $this->getLoggedInUserId());
 
@@ -486,9 +487,11 @@ class EntryControllerTest extends WallabagCoreTestCase
         $this->logInAs('admin');
         $client = $this->getClient();
 
+        $em = $client->getContainer()
+            ->get('doctrine.orm.entity_manager');
+
         // add a new content to be removed later
-        $user = $client->getContainer()
-            ->get('doctrine.orm.entity_manager')
+        $user = $em
             ->getRepository('WallabagUserBundle:User')
             ->findOneByUserName('admin');
 
@@ -502,12 +505,8 @@ class EntryControllerTest extends WallabagCoreTestCase
         $content->setArchived(true);
         $content->setLanguage('fr');
 
-        $client->getContainer()
-            ->get('doctrine.orm.entity_manager')
-            ->persist($content);
-        $client->getContainer()
-            ->get('doctrine.orm.entity_manager')
-            ->flush();
+        $em->persist($content);
+        $em->flush();
 
         $client->request('GET', '/view/'.$content->getId());
         $this->assertEquals(200, $client->getResponse()->getStatusCode());
diff --git a/tests/Wallabag/CoreBundle/Controller/TagControllerTest.php b/tests/Wallabag/CoreBundle/Controller/TagControllerTest.php
index 86a6cca24..769ce66eb 100644
--- a/tests/Wallabag/CoreBundle/Controller/TagControllerTest.php
+++ b/tests/Wallabag/CoreBundle/Controller/TagControllerTest.php
@@ -3,6 +3,7 @@
 namespace Tests\Wallabag\CoreBundle\Controller;
 
 use Tests\Wallabag\CoreBundle\WallabagCoreTestCase;
+use Wallabag\CoreBundle\Entity\Tag;
 
 class TagControllerTest extends WallabagCoreTestCase
 {
@@ -134,36 +135,48 @@ class TagControllerTest extends WallabagCoreTestCase
         $client->request('GET', '/remove-tag/'.$entry->getId().'/'.$tag->getId());
 
         $this->assertEquals(404, $client->getResponse()->getStatusCode());
+
+        $tag = $client->getContainer()
+            ->get('doctrine.orm.entity_manager')
+            ->getRepository('WallabagCoreBundle:Tag')
+            ->findOneByLabel($this->tagName);
+
+        $this->assertNull($tag, $this->tagName.' was removed because it begun an orphan tag');
     }
 
     public function testShowEntriesForTagAction()
     {
         $this->logInAs('admin');
         $client = $this->getClient();
+        $em = $client->getContainer()
+            ->get('doctrine.orm.entity_manager');
+
+        $tag = new Tag();
+        $tag->setLabel($this->tagName);
 
         $entry = $client->getContainer()
             ->get('doctrine.orm.entity_manager')
             ->getRepository('WallabagCoreBundle:Entry')
             ->findByUrlAndUserId('http://0.0.0.0/entry4', $this->getLoggedInUserId());
 
-        $tag = $client->getContainer()
-            ->get('doctrine.orm.entity_manager')
-            ->getRepository('WallabagCoreBundle:Tag')
-            ->findOneByEntryAndTagLabel($entry, 'foo');
+        $tag->addEntry($entry);
 
-        $crawler = $client->request('GET', '/tag/list/'.$tag->getSlug());
-
-        $this->assertEquals(200, $client->getResponse()->getStatusCode());
-        $this->assertCount(2, $crawler->filter('div[class=entry]'));
+        $em->persist($entry);
+        $em->persist($tag);
+        $em->flush();
 
         $tag = $client->getContainer()
             ->get('doctrine.orm.entity_manager')
             ->getRepository('WallabagCoreBundle:Tag')
-            ->findOneByLabel('baz');
+            ->findOneByEntryAndTagLabel($entry, $this->tagName);
 
         $crawler = $client->request('GET', '/tag/list/'.$tag->getSlug());
 
         $this->assertEquals(200, $client->getResponse()->getStatusCode());
-        $this->assertCount(1, $crawler->filter('div[class=entry]'));
+        $this->assertCount(1, $crawler->filter('[id*="entry-"]'));
+
+        $entry->removeTag($tag);
+        $em->remove($tag);
+        $em->flush();
     }
 }