diff --git a/Dockerfile b/Dockerfile
index 1407f1a..33b9686 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -5,6 +5,7 @@ RUN npm ci
 COPY . ./
 RUN npm run build
 
-FROM nginx:alpine
+FROM nginx
 COPY --from=build /app/dist /usr/share/nginx/html
-COPY nginx.conf /etc/nginx/conf.d/default.conf
+COPY nginx.conf.template /etc/nginx/conf.d/default.conf.template
+RUN echo "envsubst '$ESI_USER_AGENT' < /etc/nginx/conf.d/default.conf.template > /etc/nginx/conf.d/default.conf && cat /etc/nginx/conf.d/default.conf" > /docker-entrypoint.d/40-envsubst.sh & chmod +x /docker-entrypoint.d/40-envsubst.sh
diff --git a/nginx.conf b/nginx.conf.template
similarity index 94%
rename from nginx.conf
rename to nginx.conf.template
index 7d79c2a..0887be5 100644
--- a/nginx.conf
+++ b/nginx.conf.template
@@ -26,6 +26,6 @@ server {
         proxy_ssl_server_name on;
         proxy_set_header Host "esi.evetech.net";
         proxy_set_header X-Forwarded-Proto https;
-        proxy_set_header User-Agent ${ESI_USER_AGENT};
+        proxy_set_header User-Agent $ESI_USER_AGENT;
     }
 }
\ No newline at end of file