diff --git a/.mailmap b/.mailmap
index ac4210bdd8..c5e6f1401e 100644
--- a/.mailmap
+++ b/.mailmap
@@ -11,6 +11,7 @@ Matthew Flatt       <mflatt@racket-lang.org>      <mflatt@debian.cs.utah.edu>
 Matthew Flatt       <mflatt@racket-lang.org>      <mflatt@localhost.(none)>
 Matthew Flatt       <mflatt@racket-lang.org>      <mflatt@mflatt-laptop.(none)>
 Matthew Flatt       <mflatt@racket-lang.org>      <mflatt@mflatt-VirtualBox.(none)>
+Matthew Flatt       <mflatt@racket-lang.org>      <mflatt@ubuntu-12-64.(none)>
 Kathy Gray          <kathyg@racket-lang.org>      <kathryn.gray@cl.cam.ac.uk>
 Kathy Gray          <kathyg@racket-lang.org>      <kathyg@c0133.aw.cl.cam.ac.uk>
 Matthias Felleisen  <matthias@racket-lang.org>    <matthias@ccs.neu.edu>