diff --git a/templates/not_found.html.ep b/templates/not_found.html.ep
index 8410580..87d649b 100644
--- a/templates/not_found.html.ep
+++ b/templates/not_found.html.ep
@@ -1,6 +1,6 @@
 % my $msg = stash('msg') // loc('notFound');
 % layout 'main', title => 'KorAP: ' . loc('notFound');
 
-<p class="no-results"><%= $msg %></p>
+<p class="no-results" data-testid="error-message"><%= $msg %></p>
 
 % notify('warn' => $msg);