diff --git a/buildbot/master/master.cfg b/buildbot/master/master.cfg
index f255abe9..95b55762 100644
--- a/buildbot/master/master.cfg
+++ b/buildbot/master/master.cfg
@@ -104,7 +104,8 @@ common_test_env = {
 linux_test_env = dict({
     'DISPLAY': ':0',
     'CARGO_HOME': '/home/servo/.cargo',
-    'SERVO_CACHE_DIR': '/home/servo/.servo'
+    'SERVO_CACHE_DIR': '/home/servo/.servo',
+    'SHELL': '/bin/bash'
 }, **common_test_env)
 linux_headless_env = dict({'SERVO_HEADLESS': '1'}, **linux_test_env)