diff --git a/frontend/Dockerfile b/frontend/Dockerfile
index 81b5a6c..6dcd175 100644
--- a/frontend/Dockerfile
+++ b/frontend/Dockerfile
@@ -49,6 +49,10 @@ COPY frontend/ ./
 ARG NEXT_PUBLIC_API_URL=https://backend.np-dms.work/api
 ENV NEXT_PUBLIC_API_URL=${NEXT_PUBLIC_API_URL}
 
+# AUTH_URL for NextAuth redirects
+ARG AUTH_URL=https://lcbp3.np-dms.work
+ENV AUTH_URL=${AUTH_URL}
+
 # Prevent OOMs during build by limiting Node memory to 2GB and disabling telemetry
 ENV NODE_OPTIONS="--max-old-space-size=2048"
 ENV NEXT_TELEMETRY_DISABLED=1