diff --git a/unidiff/patch.py b/unidiff/patch.py
index bee28fc..ece5506 100644
--- a/unidiff/patch.py
+++ b/unidiff/patch.py
@@ -278,6 +278,9 @@ def _parse_hunk(self, header, diff, encoding, metadata_only):
         target_line_no = hunk.target_start
         expected_source_end = source_line_no + hunk.source_length
         expected_target_end = target_line_no + hunk.target_length
+        if hunk.section_header:
+            expected_source_end -= 1
+            expected_target_end -= 1
         added = 0
         removed = 0