diff --git a/etc/taskcluster/macos/config/roster b/etc/taskcluster/macos/config/roster
index 6a2ace9eeef..4bc8e4f718f 100644
--- a/etc/taskcluster/macos/config/roster
+++ b/etc/taskcluster/macos/config/roster
@@ -3,4 +3,8 @@ mac1:
 mac2:
     host: servo-tc-mac2.servo.org
 mac3:
-    host: servo-tc-mac3.servo.org
\ No newline at end of file
+    host: servo-tc-mac3.servo.org
+mac4:
+    host: servo-tc-mac4.servo.org
+mac5:
+    host: servo-tc-mac5.servo.org