diff --git a/supervisord.py b/supervisord.py
index c1e2564e721634bfb542266e58bff33232946ad1_c3VwZXJ2aXNvcmQucHk=..c2ddfe9f6023720ad156ea4d87fd3ae7d5fb72d5_c3VwZXJ2aXNvcmQucHk= 100644
--- a/supervisord.py
+++ b/supervisord.py
@@ -518,7 +518,7 @@
             starlet.forcex(pid, code=ssdef.SS__FORCEX)
         self.process.state = ProcessStates.STOPPING
         if self.timer_item:
-            self.timer_item.cancel
+            self.timer_item.cancel = True
         self.timer_item = TimerItem(TimerItemType.PROC_STOPPING, self)
         timer_queue.put(
             PrioritizedItem(current_tick + self.stopwaitsecs, self.timer_item)