diff --git a/Dockerfile b/Dockerfile
index 0655ecf..3dddd7d 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -21,7 +21,7 @@ RUN yarn build
 # --- Stage 3: Runner ---
 FROM node:20-alpine AS runner
 ARG DATABASE_URL
-ENV DATABASE_URL $DATABASE_URL
+ENV DATABASE_URL=${DATABASE_URL}
 RUN corepack enable
 RUN corepack prepare yarn@stable --activate
 WORKDIR /app