diff --git a/homeassistant/components/forked_daapd/media_player.py b/homeassistant/components/forked_daapd/media_player.py
index eb9d361504d5..2a5e04361582 100644
--- a/homeassistant/components/forked_daapd/media_player.py
+++ b/homeassistant/components/forked_daapd/media_player.py
@@ -470,9 +470,11 @@ class ForkedDaapdMaster(MediaPlayerEntity):
         return self._player["volume"] == 0
 
     @property
-    def media_content_id(self):
+    def media_content_id(self) -> str | None:
         """Content ID of current playing media."""
-        return self._player["item_id"]
+        if (item_id := self._player["item_id"]) == 0:
+            return None
+        return str(item_id)
 
     @property
     def media_content_type(self):
diff --git a/tests/components/forked_daapd/test_media_player.py b/tests/components/forked_daapd/test_media_player.py
index 8f0105d48d78..d3bbcb4ec2bd 100644
--- a/tests/components/forked_daapd/test_media_player.py
+++ b/tests/components/forked_daapd/test_media_player.py
@@ -367,7 +367,7 @@ def test_master_state(hass: HomeAssistant) -> None:
     assert state.attributes[ATTR_SUPPORTED_FEATURES] == SUPPORTED_FEATURES
     assert not state.attributes[ATTR_MEDIA_VOLUME_MUTED]
     assert state.attributes[ATTR_MEDIA_VOLUME_LEVEL] == 0.2
-    assert state.attributes[ATTR_MEDIA_CONTENT_ID] == 12322
+    assert state.attributes[ATTR_MEDIA_CONTENT_ID] == "12322"
     assert state.attributes[ATTR_MEDIA_CONTENT_TYPE] == MediaType.MUSIC
     assert state.attributes[ATTR_MEDIA_DURATION] == 0.05
     assert state.attributes[ATTR_MEDIA_POSITION] == 0.005