diff --git a/docling_core/types/doc/document.py b/docling_core/types/doc/document.py
index f104e654..80c9d86f 100644
--- a/docling_core/types/doc/document.py
+++ b/docling_core/types/doc/document.py
@@ -5918,7 +5918,7 @@ def _with_pictures_refs(
                                 scale = img.size[0] / item.prov[0].bbox.width
                                 item.image = ImageRef.from_pil(image=img, dpi=round(72 * scale))
                             elif item.image is not None:
-                                item.image.uri = Path(obj_path)
+                                item.image.uri = Path(obj_path).as_posix()
 
                         # if item.image._pil is not None:
                         #    item.image._pil.close()