diff --git a/mopidy/http/handlers.py b/mopidy/http/handlers.py
index 00fbf083..18b56de2 100644
--- a/mopidy/http/handlers.py
+++ b/mopidy/http/handlers.py
@@ -103,7 +103,7 @@ class WebSocketHandler(tornado.websocket.WebSocketHandler):
                     'Sent WebSocket message to %s: %r',
                     self.request.remote_ip, response)
         except Exception as e:
-            logger.error('WebSocket request error:', e)
+            logger.error('WebSocket request error: %s', e)
             self.close()