diff --git a/CHANGELOG.md b/CHANGELOG.md
index 23f73485..97869621 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,7 +5,7 @@
 * Add: option [auth] type oauth2 by code migration from https://gitlab.mim-libre.fr/alphabet/radicale_oauth/-/blob/dev/oauth2/
 * Fix: catch OS errors on PUT MKCOL MKCALENDAR MOVE PROPPATCH (insufficient storage, access denied, internal server error)
 * Test: skip bcrypt related tests if module is missing
-* Improve: relax mtime check on storage filesystem
+* Improve: relax mtime check on storage filesystem, change test file location to "collection-root" directory
 
 ## 3.4.1
 * Add: option [auth] dovecot_connection_type / dovecot_host / dovecot_port
diff --git a/radicale/storage/multifilesystem/__init__.py b/radicale/storage/multifilesystem/__init__.py
index 1a933d14..c5b8d439 100644
--- a/radicale/storage/multifilesystem/__init__.py
+++ b/radicale/storage/multifilesystem/__init__.py
@@ -94,7 +94,7 @@ class Storage(
 
     def _analyse_mtime(self):
         # calculate and display mtime resolution
-        path = os.path.join(self._filesystem_folder, ".Radicale.mtime_test")
+        path = os.path.join(self._get_collection_root_folder(), ".Radicale.mtime_test")
         logger.debug("Storage item mtime resolution test with file: %r", path)
         try:
             with open(path, "w") as f: