diff --git a/speedtest/docker-compose.yml b/speedtest/docker-compose.yml
index 8468ef8..c03b9a1 100644
--- a/speedtest/docker-compose.yml
+++ b/speedtest/docker-compose.yml
@@ -14,7 +14,7 @@ services:
       - SPEEDTEST_SERVERS=${SPEEDTEST_SERVERS}
       - SPEEDTEST_PING_URL=${SPEEDTEST_PING_URL}
       - PRUNE_RESULTS_OLDER_THAN=${PRUNE_RESULTS_OLDER_THAN}
-      - APP_TIMEZONE=${APP_TIMEZONE}
+      - TZ=${APP_TIMEZONE}
     volumes:
       - ./config:/config
     restart: unless-stopped