diff --git a/peripherals/proxy/Dockerfile b/peripherals/proxy/Dockerfile
index 1ab2a8b..371bceb 100644
--- a/peripherals/proxy/Dockerfile
+++ b/peripherals/proxy/Dockerfile
@@ -2,6 +2,7 @@ FROM openresty/openresty:alpine
 ARG WRITE_ENDPOINT
 ARG READ_ENDPOINT
 ARG TEST_ENDPOINT
+ARG WS_ENDPOINT
 COPY nginx.conf /usr/local/openresty/nginx/conf/nginx.conf
 RUN sed -i "s/WRITE_ENDPOINT/${WRITE_ENDPOINT}/g" /usr/local/openresty/nginx/conf/nginx.conf
 RUN sed -i "s/READ_ENDPOINT/${READ_ENDPOINT}/g" /usr/local/openresty/nginx/conf/nginx.conf