diff --git a/build_files/buildbot/slave_compile.py b/build_files/buildbot/slave_compile.py
index d66a0302be7..634a1aca77e 100644
--- a/build_files/buildbot/slave_compile.py
+++ b/build_files/buildbot/slave_compile.py
@@ -184,7 +184,7 @@ if 'cmake' in builder:
             sys.exit(retcode)
 
         if 'win32' in builder or 'win64' in builder:
-            command = ['cmake', '--build', '.', '--target', target_name]
+            command = ['cmake', '--build', '.', '--target', target_name, '--config']
         else:
             command = target_chroot_prefix + ['make', '-s', '-j2', target_name]