diff --git a/proposals/utils/pdf_diff_sections.py b/proposals/utils/pdf_diff_sections.py
index 60633e0f..b4889e48 100644
--- a/proposals/utils/pdf_diff_sections.py
+++ b/proposals/utils/pdf_diff_sections.py
@@ -1013,7 +1013,7 @@ def get_all_attachment_sections_diff(self):
 
         att_dict = self._get_matches_from_slots(self.old_slots, self.new_slots)
 
-        for owner_num in range(len(att_dict)):
+        for owner_num in att_dict.keys():
             proposal = self.new_p
             if owner_num == 0:
                 owner_obj = proposal