diff --git a/docker/entrypoint.sh b/docker/entrypoint.sh
index 4f694d2..e8d309d 100755
--- a/docker/entrypoint.sh
+++ b/docker/entrypoint.sh
@@ -6,7 +6,7 @@ rm -rf /app/static/*
 python manage.py collectstatic
 python manage.py migrate
 
-if [ -z "$1" ] || [ "${1%-}" != "$1" ]
+if [ -z "$1" ] || [ "${1#-}" != "$1" ]
 then
 	exec gunicorn ljg.wsgi "$@"
 fi