diff --git a/chronos/asyncfutures2.nim b/chronos/asyncfutures2.nim
index 16d1b739..1d806790 100644
--- a/chronos/asyncfutures2.nim
+++ b/chronos/asyncfutures2.nim
@@ -53,7 +53,7 @@ type
 
   FutureVar*[T] = distinct Future[T]
 
-  FutureDefect* = object of Exception
+  FutureDefect* = object of Defect
     cause*: FutureBase
 
   FutureError* = object of CatchableError