diff --git a/modules/src/em_opt/em_nopt.6 b/modules/src/em_opt/em_nopt.6
index 885aa4466..3efdbdeea 100644
--- a/modules/src/em_opt/em_nopt.6
+++ b/modules/src/em_opt/em_nopt.6
@@ -21,4 +21,4 @@ equivalent optimizations using the library module em_opt(3).
 .SH "SEE ALSO"
 ack(1) em_opt(1) em_opt(3)
 .SH AUTHOR
-Bruce McKenzie <bruce@cocs.canterbury.ac.nz>
+Bruce McKenzie <bruce@cosc.canterbury.ac.nz>
diff --git a/modules/src/em_opt/em_opt.3 b/modules/src/em_opt/em_opt.3
index eb8fc093d..08291c8a9 100644
--- a/modules/src/em_opt/em_opt.3
+++ b/modules/src/em_opt/em_opt.3
@@ -110,4 +110,4 @@ It is not possible to indicate that the argument of
 .B O_con_cst ()
 must be seen as an unsigned value.
 .SH AUTHOR
-Bruce McKenzie <bruce@cocs.canterbury.ac.nz>
+Bruce McKenzie <bruce@cosc.canterbury.ac.nz>