diff --git a/scripts/check_files.py b/scripts/check_files.py
index d3a61c1d6..3db3dcb2f 100755
--- a/scripts/check_files.py
+++ b/scripts/check_files.py
@@ -310,7 +310,7 @@ class TrailingWhitespaceIssueTracker(LineIssueTracker):
     """Track lines with trailing whitespace."""
 
     heading = "Trailing whitespace:"
-    suffix_exemptions = frozenset([".dsp", ".md"])
+    suffix_exemptions = frozenset([".diff", ".dsp", ".md", ".patch"])
 
     def issue_with_line(self, line, _filepath, _line_number):
         return line.rstrip(b"\r\n") != line.rstrip()