diff --git a/Dockerfile b/Dockerfile
index 197bbb8..a210b87 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -3,7 +3,7 @@ FROM mongo:5
 # we take over the default & start mongo in replica set mode in a background task
 ENTRYPOINT mongod --port $MONGO_REPLICA_PORT --replSet rs0 --bind_ip_all & MONGOD_PID=$!; \
 # we prepare the replica set with a single node and prepare the root user config
-INIT_REPL_CMD="rs.initiate()"; \
+INIT_REPL_CMD="rs.initiate({'_id':'rs0', 'members':[{'_id':0, 'host':'localhost:$MONGO_REPLICA_PORT'}]})"; \
 # we wait for the replica set to be ready and then submit the commands just above
 until (mongo admin --port $MONGO_REPLICA_PORT --eval "$INIT_REPL_CMD"); do sleep 1; done; \
 # we are done but we keep the container by waiting on signals from the mongo task