diff --git a/testproject/Dockerfile b/testproject/Dockerfile
index 1381225..721f12f 100644
--- a/testproject/Dockerfile
+++ b/testproject/Dockerfile
@@ -22,5 +22,6 @@ RUN git clone https://github.com/andrewgodwin/channels.git /srv/channels/ && \
     python setup.py install
 
 WORKDIR /srv/channels/testproject/
+ENV REDIS_URL=redis://redis:6379
 
 EXPOSE 80
diff --git a/testproject/testproject/settings.py b/testproject/testproject/settings.py
index 741508c..d14a41f 100644
--- a/testproject/testproject/settings.py
+++ b/testproject/testproject/settings.py
@@ -32,7 +32,7 @@ CHANNEL_LAYERS = {
         "BACKEND": "asgi_redis.RedisChannelLayer",
         "ROUTING": "testproject.urls.channel_routing",
         "CONFIG": {
-            "hosts": [os.environ.get('REDIS_URL', 'redis://redis:6379')],
+            "hosts": [os.environ.get('REDIS_URL', 'redis://127.0.0.1:6379')],
         }
     },
 }