diff --git a/lib/bcoin/block.js b/lib/bcoin/block.js
index e4f9fd2f..8fd6999f 100644
--- a/lib/bcoin/block.js
+++ b/lib/bcoin/block.js
@@ -81,7 +81,7 @@ Block.prototype.render = function render() {
   return bcoin.protocol.framer.block(this, this.subtype);
 };
 
-Block.prototype.size = function render() {
+Block.prototype.size = function size() {
   return this._size || this.render().length;
 };