diff --git a/nginx/nginx.conf b/nginx/nginx.conf
index 609ee26..f001d13 100644
--- a/nginx/nginx.conf
+++ b/nginx/nginx.conf
@@ -24,6 +24,9 @@ http {
 
     access_log /dev/stdout json_log;
 
+    # --- Hash bucket size for long map keys (PROXY_SECRET) ---
+    map_hash_bucket_size 128;
+
     # --- Performance ---
     sendfile on;
     tcp_nopush on;