diff --git a/buildbot/master/master.cfg b/buildbot/master/master.cfg
index f5836d47..f255abe9 100644
--- a/buildbot/master/master.cfg
+++ b/buildbot/master/master.cfg
@@ -165,8 +165,8 @@ mac2_factory.addStep(Compile(command=["./mach", "build-cef"], env=mac_test_env))
 
 mac3_factory = BuildFactory()
 mac3_factory.addStep(Git(repourl=SERVO_REPO, mode="full", method="clobber"))
-mac3_factory.addStep(Compile(command=["./mach", "build", "--dev"], env=mac_test_env))
-mac3_factory.addStep(ShellCommand(command=["./mach", "test-css", "--processes", "4",
+mac3_factory.addStep(Compile(command=["./mach", "build", "--release"], env=mac_test_env))
+mac3_factory.addStep(ShellCommand(command=["./mach", "test-css", "--release", "--processes", "4",
                                            "--log-raw", "wpt_raw.log"],
                                   env=mac_test_env,
                                   logfiles={"wpt_raw.log": "wpt_raw.log"}))