diff --git a/progress.go b/progress.go
index 2a61480..f17358f 100644
--- a/progress.go
+++ b/progress.go
@@ -307,6 +307,7 @@
 		}
 		if b.toDrop {
 			delete(bm, b)
+			s.heapUpdated = true
 		}
 		b.cancel()
 	}