diff --git a/gns3server/compute/docker/docker_vm.py b/gns3server/compute/docker/docker_vm.py
index 257fc062..7dfa4136 100644
--- a/gns3server/compute/docker/docker_vm.py
+++ b/gns3server/compute/docker/docker_vm.py
@@ -502,7 +502,7 @@ class DockerVM(BaseNode):
             msg = yield from ws.receive()
             if msg.tp == aiohttp.MsgType.TEXT:
                 out.feed_data(msg.data.encode())
-            if msg.tp == aiohttp.MsgType.BINARY:
+            elif msg.tp == aiohttp.MsgType.BINARY:
                 out.feed_data(msg.data)
             elif msg.tp == aiohttp.MsgType.ERROR:
                 log.critical("Docker WebSocket Error: {}".format(msg.data))