diff --git a/Dockerfile b/Dockerfile
index 27ab273a240d0b2331f4f573d7ebb0f05c2be2f0..ea19e3dd7363ea062b98ce4e2ee0325321cfa54a 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -41,5 +41,5 @@ RUN DEBIAN_FRONTEND=noninteractive apt-get update && \
         python3-pip \
         tox
 
-ENV LC_ALL C.UTF-8
-ENV LANG C.UTF-8
+ENV LC_ALL=C.UTF-8
+ENV LANG=C.UTF-8
diff --git a/NG-RO/osm_ng_ro/monitor.py b/NG-RO/osm_ng_ro/monitor.py
index 34af39ec601d5c8b9d8287e5d8c5f8453ca395ca..8099eb98c666c78771645396858784cc5a9bf497 100644
--- a/NG-RO/osm_ng_ro/monitor.py
+++ b/NG-RO/osm_ng_ro/monitor.py
@@ -900,6 +900,8 @@ def start_monitoring(config: dict):
     instance = MonitorVms(config)
     period = instance.refresh_config.active
     instance.run()
+    if period == -1:
+        period = 10 * 24 * 60 * 60  # 10 days (big enough)
     monitoring_task = threading.Timer(period, start_monitoring, args=(config,))
     monitoring_task.start()