diff --git a/.mailmap b/.mailmap
index 59405e1381a7fc..1e45380e421da7 100644
--- a/.mailmap
+++ b/.mailmap
@@ -146,7 +146,7 @@ Gabriel de Perthuis <g2p.code@gmail.com>
 Gareth Ellis <gareth.ellis@uk.ibm.com> <gareth@gsellis.com>
 Garwah Lam <garwahlam@gmail.com>
 Geoffrey Bugaisky <gbugaisk@gmail.com>
-Gerhard Stoebich <deb2001-github@yahoo.de>
+Gerhard Stöbich <deb2001-github@yahoo.de>
 Gibson Fahnestock <gibfahn@gmail.com> <gib@uk.ibm.com>
 Gil Pedersen <git@gpost.dk> <github@gpost.dk>
 Graham Fairweather <xotic750@gmail.com> Xotic750 <xotic750@gmail>
diff --git a/AUTHORS b/AUTHORS
index 3edda85ea3d8fb..ede5f61fe2f6a7 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -1489,7 +1489,7 @@ Madara Uchiha <me@madara.ninja>
 Gil Tayar <gil@tayar.org>
 Glenn Schlereth <Glenn.Schlereth@gmail.com>
 Artur G Vieira <vieira.artur.g@gmail.com>
-Gerhard Stoebich <deb2001-github@yahoo.de>
+Gerhard Stöbich <deb2001-github@yahoo.de>
 Sreepurna Jasti <sreepurna.jasti@gmail.com>
 Rafael Fragoso <rafaelfragosom@gmail.com>
 Andrei Cioromila <andrei.cioromila@gmail.com>