diff --git a/docker/.gitignore b/docker/.gitignore
new file mode 100644
index 0000000..f493233
--- /dev/null
+++ b/docker/.gitignore
@@ -0,0 +1 @@
+nginx.rendered.conf
diff --git a/docker/run.sh b/docker/run.sh
index 083b166..b8f0e69 100644
--- a/docker/run.sh
+++ b/docker/run.sh
@@ -2,10 +2,10 @@
 
 # Set up cache size
 CACHE_SIZE="${TAKAHE_NGINX_CACHE_SIZE:-1g}"
-sed -i s/__CACHESIZE__/${CACHE_SIZE}/g /takahe/docker/nginx.conf
+sed s/__CACHESIZE__/${CACHE_SIZE}/g /takahe/docker/nginx.conf > /takahe/docker/nginx.rendered.conf
 
 # Run nginx and gunicorn
-nginx -c "/takahe/docker/nginx.conf" &
+nginx -c "/takahe/docker/nginx.rendered.conf" &
 
 gunicorn takahe.wsgi:application -b 0.0.0.0:8001 &