diff --git a/birdnet-go/rootfs/etc/nginx/nginx.conf b/birdnet-go/rootfs/etc/nginx/nginx.conf
index fb597811c..37c27d638 100644
--- a/birdnet-go/rootfs/etc/nginx/nginx.conf
+++ b/birdnet-go/rootfs/etc/nginx/nginx.conf
@@ -66,6 +66,10 @@ http {
     tcp_nodelay             on;
     tcp_nopush              on;
 
+    map $time_iso8601 $today {
+        default "";
+    }
+
     map $http_upgrade $connection_upgrade {
         default upgrade;
         ''      close;