diff --git a/docling/pipeline/vlm_pipeline.py b/docling/pipeline/vlm_pipeline.py
index 9e4adab0..d4defa89 100644
--- a/docling/pipeline/vlm_pipeline.py
+++ b/docling/pipeline/vlm_pipeline.py
@@ -92,7 +92,7 @@ class VlmPipeline(PaginatedPipeline):
         return page
 
     def extract_text_from_backend(
-        self, page: Page, bbox: Union[BoundingBox | None]
+        self, page: Page, bbox: Union[BoundingBox, None]
     ) -> str:
         # Convert bounding box normalized to 0-100 into page coordinates for cropping
         text = ""