diff --git a/lib/http/rpc.js b/lib/http/rpc.js
index 252833eb..9bfb1983 100644
--- a/lib/http/rpc.js
+++ b/lib/http/rpc.js
@@ -1663,6 +1663,7 @@ RPC.prototype.__template = co(function* _template(version, coinbase, rules) {
     },
     coinbasevalue: attempt.coinbase.getOutputValue(),
     coinbasetxn: undefined,
+    default_witness_commitment: undefined,
     transactions: txs
   };