diff --git a/mopidy/backends/__init__.py b/mopidy/backends/__init__.py
index fc4eb6f4..f7705f64 100644
--- a/mopidy/backends/__init__.py
+++ b/mopidy/backends/__init__.py
@@ -46,10 +46,10 @@ class BaseBackend(object):
     uri_handlers = []
 
     def destroy(self):
-        '''
+        """
         Call destroy on all sub-components in backend so that they can cleanup
         after themselves.
-        '''
+        """
 
         if self.current_playlist:
             self.current_playlist.destroy()
@@ -227,7 +227,7 @@ class BaseCurrentPlaylistController(object):
         self.playlist = self.playlist.with_(tracks=before+shuffled+after)
 
     def destroy(self):
-        '''Cleanup after component'''
+        """Cleanup after component"""
         pass
 
 
@@ -284,7 +284,7 @@ class BaseLibraryController(object):
         raise NotImplementedError
 
     def destroy(self):
-        '''Cleanup after component'''
+        """Cleanup after component"""
         pass
 
 
@@ -604,7 +604,7 @@ class BasePlaybackController(object):
         raise NotImplementedError
 
     def destroy(self):
-        '''Cleanup after component'''
+        """Cleanup after component"""
         pass
 
 
@@ -720,5 +720,5 @@ class BaseStoredPlaylistsController(object):
         return filter(lambda p: query in p.name, self._playlists)
 
     def destroy(self):
-        '''Cleanup after component'''
+        """Cleanup after component"""
         pass