diff --git a/mopidy/frontends/mpd/protocol/playback.py b/mopidy/frontends/mpd/protocol/playback.py
index 7abc4509..4c602f3b 100644
--- a/mopidy/frontends/mpd/protocol/playback.py
+++ b/mopidy/frontends/mpd/protocol/playback.py
@@ -300,7 +300,7 @@ def seek(frontend, songpos, seconds):
     """
     if frontend.backend.playback.current_playlist_position != songpos:
         playpos(frontend, songpos)
-    return frontend.backend.playback.seek(int(seconds) * 1000)
+    frontend.backend.playback.seek(int(seconds) * 1000)
 
 @handle_pattern(r'^seekid "(?P<cpid>\d+)" "(?P<seconds>\d+)"$')
 def seekid(frontend, cpid, seconds):
@@ -313,7 +313,7 @@ def seekid(frontend, cpid, seconds):
     """
     if frontend.backend.playback.current_cpid != cpid:
         playid(frontend, cpid)
-    return frontend.backend.playback.seek(int(seconds) * 1000)
+    frontend.backend.playback.seek(int(seconds) * 1000)
 
 @handle_pattern(r'^setvol "(?P<volume>[-+]*\d+)"$')
 def setvol(frontend, volume):