diff --git a/pyquarantine/mailer.py b/pyquarantine/mailer.py
index b5bea6c..bd51a8c 100644
--- a/pyquarantine/mailer.py
+++ b/pyquarantine/mailer.py
@@ -16,6 +16,7 @@ import logging
 import smtplib
 
 from multiprocessing import Process, Queue
+from queue import Full as QueueFull
 
 
 logger = logging.getLogger(__name__)
@@ -82,5 +83,5 @@ def sendmail(smtp_host, smtp_port, qid, mailfrom, recipients, mail,
                 (smtp_host, smtp_port, qid, mailfrom, recipient, mail,
                  emailtype),
                 timeout=30)
-        except Queue.Full:
+        except QueueFull:
             raise RuntimeError("email queue is full")