diff --git a/livereload/watcher.py b/livereload/watcher.py
index 9815bc1..675aa3f 100644
--- a/livereload/watcher.py
+++ b/livereload/watcher.py
@@ -101,7 +101,7 @@ def examine(self):
             if changed:
                 func = item['func']
                 delay = item['delay']
-                if delay and isinstance(delay, float):
+                if delay and isinstance(delay, float) or delay == 'forever':
                     delays.add(delay)
                 if func:
                     name = getattr(func, 'name', None)