diff --git a/roles/web/files/vhost b/roles/web/files/vhost
index 671dbb7..22d5952 100644
--- a/roles/web/files/vhost
+++ b/roles/web/files/vhost
@@ -55,6 +55,10 @@ server {
 		deny all;
 	}
 
+	location ~ ^/wiki/lib.*\.(gif|png|ico|jpg)$ {
+		expires 31d;
+	}
+
 	location /static {
 		autoindex on;
 	}