diff --git a/default.conf b/default.conf
index 5b22619..4c1639d 100644
--- a/default.conf
+++ b/default.conf
@@ -6,7 +6,7 @@ server {
 	client_max_body_size 100M;
 	add_header Last-Modified $date_gmt;
 	add_header Cache-Control 'private no-store, no-cache, must-revalidate, proxy-revalidate, max-age=0';
-	is_modified_since off;
+	if_modified_since off;
 	expires off;
 	etag off;