1 files changed, 1 insertions, 1 deletions
diff --git a/Lib/imaplib.py b/Lib/imaplib.py
index ef93f734bd..3ec75a1997 100644
--- a/Lib/imaplib.py
+++ b/Lib/imaplib.py
@@ -539,7 +539,7 @@ class IMAP4:
         # Mandated responses are ('FLAGS', 'EXISTS', 'RECENT', 'UIDVALIDITY')
         self.untagged_responses = {}    # Flush old responses.
         self.is_readonly = readonly
-        if readonly:
+        if readonly is not None:
             name = 'EXAMINE'
         else:
             name = 'SELECT'