diff --git a/tools/cluster-merge b/tools/cluster-merge
index d006869ad2332d0fa2008552ff716a7d31b15270..d2ef90ec90ce4f05dfb1384b8dcd98907b74019c 100755
--- a/tools/cluster-merge
+++ b/tools/cluster-merge
@@ -263,7 +263,7 @@ class Merger(object):
     fake_ec_id = 0 # Needs to be uniq over the whole config merge
 
     for data in self.merger_data:
-      other_config = config.ConfigWriter(data.config_path)
+      other_config = config.ConfigWriter(data.config_path, accept_foreign=True)
 
       for node in other_config.GetNodeList():
         node_info = other_config.GetNodeInfo(node)