diff --git a/files/acme_renew_cert.py b/files/acme_renew_cert.py
index 0a8a935..4cf3845 100755
--- a/files/acme_renew_cert.py
+++ b/files/acme_renew_cert.py
@@ -89,11 +89,11 @@ def perform_http01_challenge(
     :rtype: str
     """
     response, validation = challenge.response_and_validation(client_acme.net.key)
-    validation_filename, validation_content = validation.split('.')
+    validation_filename, _ = validation.split('.')
 
     challenge_path = os.path.join(challenge_dir, validation_filename)
     with open(challenge_path, 'w') as f_out:
-        f_out.write(validation_content)
+        f_out.write(validation)
 
     client_acme.answer_challenge(challenge, response)