diff --git a/ais/tag_block.py b/ais/tag_block.py
index 07485f9..d26c97a 100644
--- a/ais/tag_block.py
+++ b/ais/tag_block.py
@@ -136,7 +136,7 @@ def put(self, line, line_num=None):
         if decoded:
           msg['decoded'] = decoded
         else:
-          logger.info('No NMEA match for line: %d, %s', line_num, line)
+          logger.info('No NMEA match for line: %d, %s', self.line_num, line)
       Queue.Queue.put(self, msg)
       return