diff --git a/dockercoins/rng/Dockerfile b/dockercoins/rng/Dockerfile
index ec58a56a..06ed5154 100644
--- a/dockercoins/rng/Dockerfile
+++ b/dockercoins/rng/Dockerfile
@@ -3,5 +3,5 @@ WORKDIR /app
 RUN pip install Flask
 COPY rng.py .
 ENV FLASK_APP=rng FLASK_RUN_HOST=:: FLASK_RUN_PORT=80
-CMD ["flask", "run"]
+CMD ["flask", "run", "--without-threads"]
 EXPOSE 80