diff --git a/plugins/log.py b/plugins/log.py
index cbdf33b..7a9d601 100644
--- a/plugins/log.py
+++ b/plugins/log.py
@@ -32,7 +32,7 @@ irc_color_re = re.compile(r'(\x03(\d+,\d+|\d)|[\x0f\x02\x16\x1f])')
 
 def get_log_filename(dir, server, chan):
     return os.path.join(dir, 'log', gmtime('%Y'), server,
-            gmtime('%%s.%m-%d.log') % chan).lower()
+            (gmtime('%%s.%m-%d.log') % chan).lower())
 
 
 def gmtime(format):