diff --git a/includes/controller/shifts_controller.php b/includes/controller/shifts_controller.php
index b166feeb..e1b3866b 100644
--- a/includes/controller/shifts_controller.php
+++ b/includes/controller/shifts_controller.php
@@ -386,7 +386,7 @@ function shifts_json_export_controller()
 
     if (
         !$request->has('key')
-        || !preg_match('/^[\da-f]{32}$/', $request->input('key'))
+        || !$request->input('key')
         || !$user
     ) {
         throw new HttpForbidden('{"error":"Missing or invalid key"}', ['content-type' => 'application/json']);
diff --git a/includes/pages/user_atom.php b/includes/pages/user_atom.php
index e79b3d46..e21a13c4 100644
--- a/includes/pages/user_atom.php
+++ b/includes/pages/user_atom.php
@@ -15,7 +15,7 @@ function user_atom()
 
     if (
         !$request->has('key')
-        || !preg_match('/^[\da-f]{32}$/', $request->input('key'))
+        || !$request->input('key')
         || empty($user)
     ) {
         throw new HttpForbidden('Missing or invalid key', ['content-type' => 'text/text']);
@@ -50,7 +50,7 @@ function make_atom_entries_from_news($news_entries)
 <title>' . config('app_name') . '</title>
 <id>' . $request->getHttpHost()
     . htmlspecialchars(preg_replace(
-        '#[&?]key=[a-f\d]{32}#',
+        '#[&?]key=[a-f\d]+#',
         '',
         $request->getRequestUri()
     ))
diff --git a/includes/pages/user_ical.php b/includes/pages/user_ical.php
index 6af4cd5d..5d7ec83a 100644
--- a/includes/pages/user_ical.php
+++ b/includes/pages/user_ical.php
@@ -13,7 +13,7 @@ function user_ical()
 
     if (
         !$request->has('key')
-        || !preg_match('/^[\da-f]{32}$/', $request->input('key'))
+        || !$request->input('key')
         || !$user
     ) {
         throw new HttpForbidden('Missing or invalid key', ['content-type' => 'text/text']);