diff --git a/PyPDF2/generic.py b/PyPDF2/generic.py
index 719b6948c..3b2a7c8d4 100644
--- a/PyPDF2/generic.py
+++ b/PyPDF2/generic.py
@@ -565,7 +565,11 @@ def write_to_stream(
             stream.write(b"(")
             for c in bytearr:
                 if not chr(c).isalnum() and c != b" ":
-                    stream.write(b_(rf"\{c:0>3o}"))
+                    # This:
+                    #   stream.write(b_(rf"\{c:0>3o}"))
+                    # gives
+                    #   https://github.com/davidhalter/parso/issues/207
+                    stream.write(b_("\\%03o" % c))
                 else:
                     stream.write(b_(chr(c)))
             stream.write(b")")