diff --git a/stream/ws_client.py b/stream/ws_client.py
index 1cc56cdd..ac7dd281 100644
--- a/stream/ws_client.py
+++ b/stream/ws_client.py
@@ -111,7 +111,7 @@ def readline_channel(self, channel, timeout=None):
 
     def write_channel(self, channel, data):
         """Write data to a channel."""
-        self.sock.send(chr(channel) + data)
+        self.sock.send(bytearray((channel,)) + data)
 
     def peek_stdout(self, timeout=0):
         """Same as peek_channel with channel=1."""