diff --git a/tests/test_shows.py b/tests/test_shows.py
index 58da4fb..b4ba3a6 100644
--- a/tests/test_shows.py
+++ b/tests/test_shows.py
@@ -159,3 +159,12 @@ def test_next_episode():
 def test_last_episode():
     got = TVShow('Game of Thrones')
     assert isinstance(got.last_episode, TVEpisode)
+
+
+def test_show_ids_include_tvdb():
+    # tvdb is a primary Trakt id with an existing accessor; it must be present
+    # in .ids so downstream tvdb-guid matching (e.g. PlexTraktSync) resolves.
+    # Regression for tvdb being omitted from the ids accessor list.
+    got = TVShow('Game of Thrones')
+    assert got.tvdb == 121361
+    assert got.ids['ids']['tvdb'] == 121361
diff --git a/trakt/mixins.py b/trakt/mixins.py
index 3859dee..8c30241 100644
--- a/trakt/mixins.py
+++ b/trakt/mixins.py
@@ -35,7 +35,7 @@ class IdsMixin:
     This is replacement for extract_ids() utility method.
     """
 
-    __ids = ['imdb', 'slug', 'tmdb', 'trakt']
+    __ids = ['imdb', 'slug', 'tmdb', 'trakt', 'tvdb']
 
     def __init__(self, ids=None):
         if ids is None:
@@ -45,10 +45,11 @@ def __init__(self, ids=None):
     @property
     def ids(self):
         """
-        Accessor to the trakt, imdb, and tmdb ids,
-        as well as the trakt.tv slug
+        Accessor to the trakt, imdb, tmdb and tvdb ids, as well as the
+        trakt.tv slug. Only ids present on the object are included.
         """
         ids = {k: getattr(self, k, None) for k in self.__ids}
+        ids = {k: v for k, v in ids.items() if v is not None}
         return {
             'ids': ids
         }