diff --git a/modules/server/containers/apps/selfmark.nix b/modules/server/containers/apps/selfmark.nix
index 9ae3f71..ace44e0 100644
--- a/modules/server/containers/apps/selfmark.nix
+++ b/modules/server/containers/apps/selfmark.nix
@@ -61,6 +61,7 @@ in {
         # WELIB_MIRROR_URLS = "https://welib.org"; #avoid
       } // lib.optionalAttrs(containerCfg.subpath != null) {
         BASE_PATH = "/${containerCfg.subpath}";
+        URL_BASE = "/${containerCfg.subpath}";
       } // lib.optionalAttrs(serverCfg.containers?calibre) {
         CALIBRE_WEB_URL = "https://${serverCfg.containers.calibre.subdomain}.${serverCfg.domain}";
       } // lib.optionalAttrs(serverCfg.containers?authentik) {