diff --git a/Lib/email/_parseaddr.py b/Lib/email/_parseaddr.py
index 791d892..81913a3 100644
--- a/Lib/email/_parseaddr.py
+++ b/Lib/email/_parseaddr.py
@@ -109,7 +109,7 @@
         return None
     tzoffset = None
     tz = tz.upper()
-    if _timezones.has_key(tz):
+    if tz in _timezones:
         tzoffset = _timezones[tz]
     else:
         try: