diff --git a/lib/plausible_web/templates/layout/base_error.html.heex b/lib/plausible_web/templates/layout/base_error.html.heex
index d631ff44faec..e18613c4952c 100644
--- a/lib/plausible_web/templates/layout/base_error.html.heex
+++ b/lib/plausible_web/templates/layout/base_error.html.heex
@@ -1,5 +1,5 @@
 <!DOCTYPE html>
-<html lang="en" class="h-full">
+<html lang="en" class="h-full plausible">
   <head>
     <meta charset="utf-8" />
     <meta http-equiv="X-UA-Compatible" content="IE=edge" />
