diff --git a/experimental/chatproto/lexicons/app/andref/chatproto/getMessages.json b/experimental/chatproto/lexicons/app/andref/chatproto/getMessages.json
index 2fef479..e5169c2 100644
--- a/experimental/chatproto/lexicons/app/andref/chatproto/getMessages.json
+++ b/experimental/chatproto/lexicons/app/andref/chatproto/getMessages.json
@@ -10,8 +10,7 @@
         "required": ["channelNsid"],
         "properties": {
           "channelNsid": {
-            "type": "string",
-            "format": "nsid"
+            "type": "string"
           },
           "before": {
             "type": "string",