diff --git a/lib/primitives/address.js b/lib/primitives/address.js
index 9b3bccc2..c95f122d 100644
--- a/lib/primitives/address.js
+++ b/lib/primitives/address.js
@@ -138,7 +138,20 @@ Address.prototype.verifyNetwork = function verifyNetwork(network) {
  */
 
 Address.prototype.isNull = function isNull() {
-  return util.equal(this.hash, encoding.ZERO_HASH160);
+  var i;
+
+  if (this.hash.length === 20)
+    return util.equal(this.hash, encoding.ZERO_HASH160);
+
+  if (this.hash.length === 32)
+    return util.equal(this.hash, encoding.ZERO_HASH);
+
+  for (i = 0; i < this.hash.length; i++) {
+    if (this.hash[i] !== 0)
+      return false;
+  }
+
+  return true;
 };
 
 /**