diff --git a/tests/FSharp.Core.UnitTests/FSharp.Core/Microsoft.FSharp.Control/AsyncModule.fs b/tests/FSharp.Core.UnitTests/FSharp.Core/Microsoft.FSharp.Control/AsyncModule.fs
index fce1b0fd710..e9bfc59e0c9 100644
--- a/tests/FSharp.Core.UnitTests/FSharp.Core/Microsoft.FSharp.Control/AsyncModule.fs
+++ b/tests/FSharp.Core.UnitTests/FSharp.Core/Microsoft.FSharp.Control/AsyncModule.fs
@@ -473,8 +473,9 @@ type AsyncModule() =
             let mutable running = new CountdownEvent(1)
 
             let job i = async {
-                running.AddCount 1
-                use! holder = Async.OnCancel (running.Signal >> ignore)
+                use! holder =
+                    running.AddCount 1
+                    Async.OnCancel (running.Signal >> ignore)
                 do! failOnlyOne |> Async.AwaitWaitHandle |> Async.Ignore
                 running.Signal() |> ignore
                 failwith "boom"