diff --git a/build/buildbot/config/common.xml b/build/buildbot/config/common.xml
index 86f9c3c4f8..b99af4c177 100644
--- a/build/buildbot/config/common.xml
+++ b/build/buildbot/config/common.xml
@@ -59,6 +59,14 @@
 
 <nightly-schedulers name="daily"/>
 
+<!--
+    General purpose slave lock.
+-->
+
+<slavelock>
+    <name>slave</name>
+</slavelock>
+
 <!--
     Map SVN user ids to email addresses.
 -->