diff --git a/PyPDF2/pdf.py b/PyPDF2/pdf.py
index 1d0e95011..4c65b1e6c 100644
--- a/PyPDF2/pdf.py
+++ b/PyPDF2/pdf.py
@@ -1734,6 +1734,7 @@ def readObjectHeader(self, stream):
         idnum = readUntilWhitespace(stream)
         extra |= utils.skipOverWhitespace(stream); stream.seek(-1, 1)
         generation = readUntilWhitespace(stream)
+        extra |= utils.skipOverWhitespace(stream); stream.seek(-1, 1)
 
         # although it's not used, it might still be necessary to read
         _obj = stream.read(3)  # noqa: F841