diff --git a/checkmk/compose.yaml b/checkmk/compose.yaml
index e44f4e8..3b94f16 100644
--- a/checkmk/compose.yaml
+++ b/checkmk/compose.yaml
@@ -13,6 +13,7 @@ services:
     environment:
       - CMK_PASSWORD=${CMK_PASSWORD:-password}
       - CMK_SITE_ID=cmk
+      - TZ=${TZ:-Etc/UTC}
     labels:
       - "traefik.enable=true"
       - "traefik.docker.network=proxy"