diff --git a/channels/worker.py b/channels/worker.py
index 31e0288..77c1dcb 100644
--- a/channels/worker.py
+++ b/channels/worker.py
@@ -20,14 +20,14 @@ class Worker(object):
     """
 
     def __init__(
-            self,
-            channel_layer,
-            callback=None,
-            message_retries=10,
-            signal_handlers=True,
-            only_channels=None,
-            exclude_channels=None
-            ):
+        self,
+        channel_layer,
+        callback=None,
+        message_retries=10,
+        signal_handlers=True,
+        only_channels=None,
+        exclude_channels=None
+    ):
         self.channel_layer = channel_layer
         self.callback = callback
         self.message_retries = message_retries