diff --git a/lib/http/rpc.js b/lib/http/rpc.js
index 2f56515d..a21efaec 100644
--- a/lib/http/rpc.js
+++ b/lib/http/rpc.js
@@ -500,7 +500,7 @@ RPC.prototype.getBlock = co(function* getBlock(args, help) {
   var details = valid.bool(2, false);
   var entry, block;
 
-  if (help || args.length < 1 || args.length > 2)
+  if (help || args.length < 1 || args.length > 3)
     throw new RPCError(errs.MISC_ERROR, 'getblock "hash" ( verbose )');
 
   if (!hash)