diff --git a/offlineimap/imapserver.py b/offlineimap/imapserver.py
index b00fd08..84b1289 100644
--- a/offlineimap/imapserver.py
+++ b/offlineimap/imapserver.py
@@ -479,7 +479,7 @@ class IMAPServer:
                         " to the correct port." % (self.hostname, self.port)
                 else:
                     reason = "Unknown SSL protocol connecting to host '%s' for"\
-                         "repository '%s'. OpenSSL responded:\n%s"\
+                         " repository '%s'. OpenSSL responded:\n%s"\
                          % (self.hostname, self.repos, e)
                 raise OfflineImapError(reason, severity)