diff --git a/utils/checkstyle.py b/utils/checkstyle.py
index fb03dc34..db5a550d 100755
--- a/utils/checkstyle.py
+++ b/utils/checkstyle.py
@@ -471,6 +471,7 @@ class TrailersChecker(CommitChecker):
     known_trailers = {
         'Acked-by': email_regex,
         'Bug': link_regex,
+        'Co-developed-by': email_regex,
         'Fixes': commit_regex,
         'Link': link_regex,
         'Reported-by': validate_reported_by,