diff --git a/buildbot/master/files/config/master.cfg b/buildbot/master/files/config/master.cfg
index 67603770..8f4536aa 100644
--- a/buildbot/master/files/config/master.cfg
+++ b/buildbot/master/files/config/master.cfg
@@ -10,7 +10,7 @@ from passwords import HOMU_BUILDBOT_SECRET, GITHUB_STATUS_TOKEN
 
 LINUX_SLAVES = ["servo-linux{}".format(i) for i in range(1, 7)]
 MAC_SLAVES = ["servo-mac2", "servo-mac3", "servo-mac4", "servo-macpro1"]
-CROSS_SLAVES = ["servo-linux-cross{}".format(i) for i in range(1, 3)]
+CROSS_SLAVES = ["servo-linux-cross{}".format(i) for i in range(1, 4)]
 WINDOWS_SLAVES = ["servo-windows{}".format(i) for i in range(1, 3)]