diff --git a/docker-compose.yml b/docker-compose.yml
index b0aea405..cfe4f69c 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -4116,7 +4116,7 @@ services:
       - --web.telemetry-path="/metrics"
     container_name: mongodb-exporter
     environment:
-      $MONGODB_URI: mongodb://${MONGO_INITDB_ROOT_USERNAME}:${MONGO_INITDB_ROOT_PASSWORD}@mongodb:27017/admin?replicaSet=rinoa
+      MONGODB_URI: mongodb://${MONGO_INITDB_ROOT_USERNAME}:${MONGO_INITDB_ROOT_PASSWORD}@mongodb:27017/admin?replicaSet=rinoa
     image: percona/mongodb_exporter:0.47.1@sha256:8ba5d6e25fe7e30912f10b01a9e16e14c6c3af05f36dcaed0659690d70dc1670
     ports:
       - 9216:9216