diff --git a/flexmeasures/app.py b/flexmeasures/app.py
index 051600508..7f8d20aac 100644
--- a/flexmeasures/app.py
+++ b/flexmeasures/app.py
@@ -73,7 +73,7 @@ def create(  # noqa C901
     if app.testing:
         from fakeredis import FakeStrictRedis
 
-        redis_conn = FakeStrictRedis()
+        redis_conn = FakeStrictRedis(host="redis", port="1234")
     else:
         redis_conn = Redis(
             app.config["FLEXMEASURES_REDIS_URL"],