diff --git a/frontend/Dockerfile b/frontend/Dockerfile
index 802b149..78bbdef 100644
--- a/frontend/Dockerfile
+++ b/frontend/Dockerfile
@@ -18,7 +18,7 @@ ARG HCAPTCHA_SITE_KEY
 ENV NEXT_PUBLIC_HCAPTCHA_SITE_KEY=${HCAPTCHA_SITE_KEY}
 
 # Create a .env file before build
-RUN echo "NEXT_PUBLIC_HCAPTCHA_SITE_KEY=$HCAPTCHA_SITE_KEY"
+RUN echo "NEXT_PUBLIC_HCAPTCHA_SITE_KEY=${HCAPTCHA_SITE_KEY}"
 
 # Build the Next.js app
 RUN npm run build