diff --git a/docker-compose.yml b/docker-compose.yml
index 297c4db..a2c427c 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -14,7 +14,7 @@
         - GITBUCKET_DATABASE_NAME=${GITBUCKET_DATABASE_NAME}
         - GITBUCKET_DATABASE_USER=${GITBUCKET_DATABASE_USER}
         - GITBUCKET_DATABASE_PASSWORD=${GITBUCKET_DATABASE_PASSWORD}
-        - GITBUCKET_MAX_FILE_SIZE=${GITBUCKET_MAX_FILE_SIZE:10485760}
+        - GITBUCKET_MAX_FILE_SIZE=${GITBUCKET_MAX_FILE_SIZE:-10485760}
         - TZ=${TZ}
       volumes:
         - ./data/repositories/:/srv/gitbucket/repositories/