diff --git a/client/tools/buildbot_annotated_steps.py b/client/tools/buildbot_annotated_steps.py
index 89897a7aff3..134a94c4bed 100644
--- a/client/tools/buildbot_annotated_steps.py
+++ b/client/tools/buildbot_annotated_steps.py
@@ -23,6 +23,7 @@ import shutil
 import glob
 
 BUILDER_NAME = 'BUILDBOT_BUILDERNAME'
+BUILDER_CLOBBER = 'BUILDBOT_CLOBBER'
 REVISION = 'BUILDBOT_REVISION'
 
 # latest dartium location