diff --git a/dev/buildbot/master/master.cfg b/dev/buildbot/master/master.cfg
index 83e066eb..72c00edf 100644
--- a/dev/buildbot/master/master.cfg
+++ b/dev/buildbot/master/master.cfg
@@ -61,7 +61,7 @@ def sphinx_slave(generator = "Unix Makefiles", git_mode = 'incremental'):
     factory.addStep(DirectoryUpload(slavesrc="Web/_build/html",masterdest="public_html/sphinx",url="sphinx",compress="bz2"))
     return factory
     
-def cmake_slave(mod_name, git_mode = 'incremental', install = True, cmake_args = []):
+def cmake_slave(mod_name, git_mode = 'incremental', install = True, cmake_args = [], build_args = []):
     """
     Parameters
     ----------