diff --git a/Dockerfile b/Dockerfile
index f8e4d4b..715acd7 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -48,8 +48,10 @@ RUN cd /app/code && \
 
 # Install Node dependencies and build assets
 RUN cd /app/code && \
+    echo "APP_URL=http://localhost" > .env && \
     npm install && \
     npm run production && \
+    rm -f .env && \
     rm -rf node_modules && \
     chown -R cloudron:cloudron /app/code/public