diff --git a/ccnode/tags.py b/ccnode/tags.py
index 40f162c9a2537cc3e35d1f40cb21a4e65f6c40af..9eedba6507beca9644b325793a05e3d3521dbd2b 100644
--- a/ccnode/tags.py
+++ b/ccnode/tags.py
@@ -69,7 +69,7 @@ class Tag(object):
         self.watcher.start()
 
     def stop(self):
-        if watcher is not None:
+        if self.watcher is not None:
             self.watcher.stop()