diff --git a/source/vibe/core/file.d b/source/vibe/core/file.d
index e32efef..4bd1cda 100644
--- a/source/vibe/core/file.d
+++ b/source/vibe/core/file.d
@@ -647,8 +647,7 @@ struct DirectoryWatcher { // TODO: avoid all those heap allocations!
 		m_context = new Context; // FIME: avoid GC allocation (use FD user data slot)
 		m_context.changeEvent = createManualEvent();
 		m_watcher = eventDriver.watchers.watchDirectory(path.toNativeString, recursive, &m_context.onChange);
-		if (m_watcher == WatcherID.invalid)
-			throw new Exception("Failed to watch directory.");
+		enforce(m_watcher != WatcherID.invalid, "Failed to watch directory.");
 		m_context.path = path;
 		m_context.recursive = recursive;
 		m_context.changes = appender!(DirectoryChange[]);