diff --git a/promtail/promtail-config.yml b/promtail/promtail-config.yml
index 26a1fbc..e0e59ed 100644
--- a/promtail/promtail-config.yml
+++ b/promtail/promtail-config.yml
@@ -6,7 +6,7 @@ positions:
   filename: /tmp/positions.yaml
 
 clients:
-  - url: http://${LOKI_HOST}:3100/loki/api/v1/push
+  - url: http://${LOKI_HOST:-loki}:3100/loki/api/v1/push
 
 scrape_configs:
   - job_name: flog_scrape
diff --git a/telegraf/telegraf.conf b/telegraf/telegraf.conf
index 074c1ac..31bf920 100644
--- a/telegraf/telegraf.conf
+++ b/telegraf/telegraf.conf
@@ -80,7 +80,7 @@
   ## Multiple URLs can be specified for a single cluster, only ONE of the
   ## urls will be written to each interval.
   ##   ex: urls = ["https://us-west-2-1.aws.cloud2.influxdata.com"]
-  urls = ["http://${INFLUX_HOST}:8086"]
+  urls = ["http://${INFLUX_HOST:-influxdb}:8086"]
 
   ## Token for authentication.
   token = "$INFLUX_WRITE_TOKEN"