diff --git a/.mailmap b/.mailmap
index 46447896a6e..588d09a2ca9 100644
--- a/.mailmap
+++ b/.mailmap
@@ -23,6 +23,7 @@ Alexander A. Klimov <alexander.klimov@icinga.com> <alexander.klimov@icinga.com>
 <marius@graylog.com> <marius@torch.sh>
 <markus.frosch@icinga.com> <lazyfrosch@icinga.org>
 <markus.frosch@icinga.com> <markus@lazyfrosch.de>
+<mathias.aerts@delta.blue> <mathiasaerts@users.noreply.github.com>
 <michael.friedrich@icinga.com> <michael.friedrich@gmail.com>
 <michael.friedrich@icinga.com> <Michael.Friedrich@netways.de>
 <nicole.lang@icinga.com> <nicole.lang@netways.de>