diff --git a/core/metadata/canonical_version.py b/core/metadata/canonical_version.py
index 9871d89e..1f54a1e8 100644
--- a/core/metadata/canonical_version.py
+++ b/core/metadata/canonical_version.py
@@ -211,7 +211,7 @@ def pick_canonical_release(
 # core.library_reorganize._ALBUM_ID_COLUMNS — a test pins them in sync). A manual
 # match on any of these should pin/lock the canonical version (#758); a match on
 # a source the canonical tools don't read (e.g. lastfm) has no version to pin.
-CANONICAL_ALBUM_SOURCES = frozenset({'spotify', 'itunes', 'deezer', 'discogs', 'hydrabase'})
+CANONICAL_ALBUM_SOURCES = frozenset({'spotify', 'itunes', 'deezer', 'discogs', 'hydrabase', 'musicbrainz'})
 
 
 def should_pin_manual_canonical(entity_type: str, source: str) -> bool:
diff --git a/tests/test_canonical_manual_lock.py b/tests/test_canonical_manual_lock.py
index ad9fd99e..54f9bcea 100644
--- a/tests/test_canonical_manual_lock.py
+++ b/tests/test_canonical_manual_lock.py
@@ -24,7 +24,7 @@ from database.music_database import MusicDatabase
 # should_pin_manual_canonical — pure
 # ---------------------------------------------------------------------------
 
-@pytest.mark.parametrize('source', ['spotify', 'itunes', 'deezer', 'discogs', 'hydrabase'])
+@pytest.mark.parametrize('source', ['spotify', 'itunes', 'deezer', 'discogs', 'hydrabase', 'musicbrainz'])
 def test_pins_album_on_recognised_source(source):
     assert should_pin_manual_canonical('album', source) is True
 
@@ -34,7 +34,7 @@ def test_does_not_pin_non_album(entity):
     assert should_pin_manual_canonical(entity, 'spotify') is False
 
 
-@pytest.mark.parametrize('source', ['lastfm', 'genius', 'musicbrainz', 'audiodb', 'tidal'])
+@pytest.mark.parametrize('source', ['lastfm', 'genius', 'audiodb', 'tidal'])
 def test_does_not_pin_source_canonical_cant_read(source):
     # No album-version data the canonical tools read → nothing to pin.
     assert should_pin_manual_canonical('album', source) is False