diff --git a/nginx/Dockerfile-alpine b/nginx/Dockerfile-alpine
index ec4de64..3a7327b 100644
--- a/nginx/Dockerfile-alpine
+++ b/nginx/Dockerfile-alpine
@@ -136,7 +136,7 @@ ENV \
     BACKEND=http://localhost:80 \
     CORS_HEADER_403_ALLOW_ORIGIN="*" \
     CORS_HEADER_403_ALLOW_METHODS="GET, POST, PUT, DELETE, OPTIONS" \
-    CORS_HEADER_403_CONTENT_TYPE="text/plain" \
+    CORS_HEADER_403_CONTENT_TYPE="text/html" \
     CORS_HEADER_403_MAX_AGE=3600 \
     CORS_HEADER_ACCESS_CONTROL_ALLOW_HEADERS="*" \
     ERRORLOG=/var/log/nginx/error.log \