diff --git a/platform/core-api/src/com/intellij/openapi/vfs/VfsUtilCore.java b/platform/core-api/src/com/intellij/openapi/vfs/VfsUtilCore.java
index 4625c2f6fa1b..c3482ecb9d46 100644
--- a/platform/core-api/src/com/intellij/openapi/vfs/VfsUtilCore.java
+++ b/platform/core-api/src/com/intellij/openapi/vfs/VfsUtilCore.java
@@ -191,6 +191,7 @@ public class VfsUtilCore {
   }
 
   @SuppressWarnings("UnsafeVfsRecursion")
+  @NotNull
   public static Result visitChildrenRecursively(@NotNull VirtualFile file, @NotNull VirtualFileVisitor visitor) throws VisitorException {
     visitor.pushFrame();
     try {