diff --git a/install/debian/9/nginx/nginx.conf b/install/debian/9/nginx/nginx.conf
index 1eef1672..e8967d8e 100644
--- a/install/debian/9/nginx/nginx.conf
+++ b/install/debian/9/nginx/nginx.conf
@@ -51,6 +51,7 @@ http {
 
     # Compression
     gzip                on;
+    gzip_vary           on;
     gzip_comp_level     9;
     gzip_min_length     512;
     gzip_buffers        8 64k;