diff --git a/asyncutils.nim b/asyncutils.nim
index 8b8fe78..4e08a61 100644
--- a/asyncutils.nim
+++ b/asyncutils.nim
@@ -40,12 +40,16 @@ proc asyncExecCmd*(command: string): Future[string] =
   proc successCallback(fd: AsyncFD): bool =
     future.complete(^flowVar)
     successEvent.unregister()
+    successEvent.close()
     failureEvent.unregister()
+    failureEvent.close()
     true
   proc failureCallback(fd: AsyncFD): bool =
     future.fail(newException(OSError, ^flowVar))
     successEvent.unregister()
+    successEvent.close()
     failureEvent.unregister()
+    failureEvent.close()
     true
   addEvent(successEvent, successCallback)
   addEvent(failureEvent, failureCallback)