diff --git a/bigchaindb/models.py b/bigchaindb/models.py
index f53aed02..afb672d7 100644
--- a/bigchaindb/models.py
+++ b/bigchaindb/models.py
@@ -49,7 +49,7 @@ class Transaction(Transaction):
         validate_txn_obj('asset', tx_body['asset'], 'data', validate_key)
         validate_txn_obj('metadata', tx_body, 'metadata', validate_key)
         validate_language_key(tx_body['asset'], 'data')
-
+        validate_language_key(tx_body, 'metadata')
 
 class FastTransaction:
     """A minimal wrapper around a transaction dictionary. This is useful for