diff --git a/wkd-domain-checker/wkd-domain-checker.py b/wkd-domain-checker/wkd-domain-checker.py
index 387e96e..2b00a9f 100644
--- a/wkd-domain-checker/wkd-domain-checker.py
+++ b/wkd-domain-checker/wkd-domain-checker.py
@@ -92,8 +92,8 @@ def check_domain(domain):
     if answer['name'] != domain and answer['name'] != f'{domain}.':
         return f'CNAME lookup failed: unexpected response (domain response was for {markupsafe.escape(domain)})\n', 400
     if not answer['data'].startswith(app.config['GATEWAY_DOMAIN']):
-        return f'CNAME lookup failed: {markupsafe.escape(domain)} resolves to {markupsafe.escape(answer["data"])} (expected {GATEWAY_DOMAIN})\n', 400
-    return f'CNAME lookup ok: {markupsafe.escape(domain)} resolves to {GATEWAY_DOMAIN}\n'
+        return f'CNAME lookup failed: {markupsafe.escape(domain)} resolves to {markupsafe.escape(answer["data"])} (expected {app.config['GATEWAY_DOMAIN']})\n', 400
+    return f'CNAME lookup ok: {markupsafe.escape(domain)} resolves to {app.config['GATEWAY_DOMAIN']}\n'
 
 if __name__ == '__main__':
     app.run()