diff --git a/src/calibre/ebooks/docx/to_html.py b/src/calibre/ebooks/docx/to_html.py
index 05f1f9a95b..0bb67ad425 100644
--- a/src/calibre/ebooks/docx/to_html.py
+++ b/src/calibre/ebooks/docx/to_html.py
@@ -629,7 +629,7 @@ class Convert(object):
             if last_run[-1][1] == style:
                 last_run.append((html_obj, style))
             else:
-                self.framed.append((html_obj, style))
+                self.framed[-1].append((html_obj, style))
         else:
             last_run.append((html_obj, style))