diff --git a/dev/buildbot/master/master.cfg b/dev/buildbot/master/master.cfg
index 2ed51860..5e2966c6 100644
--- a/dev/buildbot/master/master.cfg
+++ b/dev/buildbot/master/master.cfg
@@ -273,7 +273,7 @@ c['builders'].append(
                             platform = 'windows', 
                             test = False,
                             cmake_args = ['-G','Visual Studio 10 2010'],
-                            build_args = ['-C','Release'])
+                            build_args = ['--config','Release'])
       )
       )
 c['builders'].append(