diff --git a/README_SETUP.md b/README_SETUP.md
index 13f4b1e3735ae051dabcb2bad1d2d769f10d920f..3cde99c9fc82a57524fc6e7d31d88353deeec221 100644
--- a/README_SETUP.md
+++ b/README_SETUP.md
@@ -118,7 +118,7 @@ server:
       - `INSERT_FILES_IN_DIR_ALLOWED_DIRS`: add mounted filesystems here that
         shall be accessible by CaosDB
     * Maybe set another `SESSION_TIMEOUT_MS`.
-    * See also [CONFIGURATION.md](https://gitlab.indiscale.com/caosdb/src/caosdb-server/-/blob/dev/src/doc/administration/configuration.rst)
+    * See also [CONFIGURATION.rst](https://gitlab.indiscale.com/caosdb/src/caosdb-server/-/blob/dev/src/doc/administration/configuration.rst)
 6. Copy `conf/core/usersources.ini.template` to `conf/ext/usersources.ini`.
     * You can skip this if you do not want to use an external authentication. 
       Local users (CaosDB realm) are always available.