diff --git a/beets/plugins.py b/beets/plugins.py
index 668f8585d..c0d71bec1 100644
--- a/beets/plugins.py
+++ b/beets/plugins.py
@@ -44,8 +44,6 @@ if TYPE_CHECKING:
 
     from confuse import ConfigView
 
-    from beets.autotag import AlbumInfo, TrackInfo
-    from beets.autotag.distance import Distance
     from beets.dbcore import Query
     from beets.dbcore.db import FieldQueryType
     from beets.dbcore.types import Type
@@ -299,7 +297,7 @@ def load_plugins(names: Sequence[str] = ()) -> None:
             else:
                 for obj in getattr(namespace, name).__dict__.values():
                     if (
-                        isinstance(obj, type)
+                        inspect.isclass(obj)
                         and issubclass(obj, BeetsPlugin)
                         and obj != BeetsPlugin
                         and not inspect.isabstract(obj)
@@ -520,8 +518,6 @@ def feat_tokens(for_artist: bool = True) -> str:
     )
 
 
-
-
 def apply_item_changes(
     lib: Library, item: Item, move: bool, pretend: bool, write: bool
 ) -> None: