diff --git a/src/ocrmypdf/optimize.py b/src/ocrmypdf/optimize.py
index 60affa8b..a20b8238 100644
--- a/src/ocrmypdf/optimize.py
+++ b/src/ocrmypdf/optimize.py
@@ -283,7 +283,7 @@ def _find_image_xrefs(pdf: Pdf):
 
     for pageno, page in enumerate(pdf.pages):
         _find_image_xrefs_container(
-            pdf, page, pageno, include_xrefs, exclude_xrefs, pageno_for_xref
+            pdf, page.obj, pageno, include_xrefs, exclude_xrefs, pageno_for_xref
         )
 
     working_xrefs = include_xrefs - exclude_xrefs