diff --git a/PyPDF2/_page.py b/PyPDF2/_page.py
index 20d9977f2..08a7b6ca0 100644
--- a/PyPDF2/_page.py
+++ b/PyPDF2/_page.py
@@ -517,16 +517,17 @@ def _merge_page(
         page2content = page2.get_contents()
         if page2content is not None:
             page2content = ContentStream(page2content, self.pdf)
+            rect = page2.trimbox
             page2content.operations.insert(
                 0,
                 (
                     map(
                         FloatObject,
                         [
-                            page2.trimbox.left,
-                            page2.trimbox.bottom,
-                            page2.trimbox.width,
-                            page2.trimbox.height,
+                            rect.left,
+                            rect.bottom,
+                            rect.width,
+                            rect.height,
                         ],
                     ),
                     "re",