diff --git a/mopidy/core.py b/mopidy/core.py
index b2361e59..9c4d63d4 100644
--- a/mopidy/core.py
+++ b/mopidy/core.py
@@ -1,6 +1,5 @@
 import logging
 import optparse
-import sys
 
 from mopidy import get_version, settings, OptionalDependencyError
 from mopidy.utils import get_class
diff --git a/mopidy/frontends/lastfm.py b/mopidy/frontends/lastfm.py
index d723052e..84e612fa 100644
--- a/mopidy/frontends/lastfm.py
+++ b/mopidy/frontends/lastfm.py
@@ -11,7 +11,6 @@ from pykka.actor import ThreadingActor
 
 from mopidy import settings, SettingsError
 from mopidy.frontends.base import BaseFrontend
-from mopidy.utils.process import BaseThread
 
 logger = logging.getLogger('mopidy.frontends.lastfm')
 
diff --git a/mopidy/mixers/nad.py b/mopidy/mixers/nad.py
index 3d279736..65eff58c 100644
--- a/mopidy/mixers/nad.py
+++ b/mopidy/mixers/nad.py
@@ -5,7 +5,6 @@ from pykka.actor import ThreadingActor
 
 from mopidy import settings
 from mopidy.mixers.base import BaseMixer
-from mopidy.utils.process import BaseThread
 
 logger = logging.getLogger('mopidy.mixers.nad')