diff --git a/overwolf.d.ts b/overwolf.d.ts
index 7693bf5..a3304c9 100644
--- a/overwolf.d.ts
+++ b/overwolf.d.ts
@@ -111,7 +111,7 @@ declare namespace overwolf.io {
   }
 
   interface DirResult extends Result {
-    data?: FileInDir[];
+    data: FileInDir[] | null;
   }
 
   interface FileInDir {