diff --git a/watch/watch-tests.ts b/watch/watch-tests.ts
index 974176a96..d6be4092d 100644
--- a/watch/watch-tests.ts
+++ b/watch/watch-tests.ts
@@ -24,9 +24,7 @@ watch.watchTree(str, (f: any, curr: fs.Stats, prev: fs.Stats) => {
 watch.watchTree(str, opts, (f: any, curr: fs.Stats, prev: fs.Stats) => {
 
 });
-watch.unwatchTree(str => {
-
-});
+watch.unwatchTree(str);
 watch.createMonitor(str, (monitor: watch.Monitor) => {
 
 });