diff --git a/lib/src/util/multi_dir_watcher.dart b/lib/src/util/multi_dir_watcher.dart
index c8331c8a..d5600496 100644
--- a/lib/src/util/multi_dir_watcher.dart
+++ b/lib/src/util/multi_dir_watcher.dart
@@ -28,7 +28,7 @@ class MultiDirWatcher {
   ///
   /// Returns a [Future] that completes when [events] is ready to emit events
   /// from [directory].
-  Future<void> watch(String directory) {
+  Future watch(String directory) {
     var isParentOfExistingDir = false;
     for (var existingDir in _watchers.keys.toList()) {
       if (!isParentOfExistingDir &&