diff --git a/release/watcher/watcher.fsx b/release/watcher/watcher.fsx
index edb5424c..496a45d5 100644
--- a/release/watcher/watcher.fsx
+++ b/release/watcher/watcher.fsx
@@ -213,4 +213,4 @@ fsi.AddPrinter (fun (_: obj) ->
     }
     |> Async.Start
 
-    "")
+    null)