diff --git a/scripts/seo-audit.mjs b/scripts/seo-audit.mjs
index e0354068..ba866cee 100644
--- a/scripts/seo-audit.mjs
+++ b/scripts/seo-audit.mjs
@@ -11,6 +11,7 @@ const SITE_URL = (process.env.SITE_URL || 'https://www.bentopdf.com').replace(
   /\/+$/,
   ''
 );
+const BASE_PATH = (process.env.BASE_URL || '/').replace(/\/$/, '');
 const HOST = new URL(SITE_URL).hostname;
 
 const NOINDEX_ALLOWLIST = new Set(['404.html', 'wasm-settings.html']);
@@ -72,6 +73,7 @@ function expectedCanonicalForFile(rel) {
   const baseName = fileName.replace(/\.html$/, '');
   const slug = baseName === 'index' ? '' : baseName;
   const segments = [SITE_URL];
+  if (BASE_PATH) segments.push(BASE_PATH.replace(/^\//, ''));
   if (slug) segments.push(slug);
   return segments.join('/').replace(/\/+$/, '') || SITE_URL;
 }