diff --git a/lib/ecdsa.js b/lib/ecdsa.js
index f6bc3d3..14eee00 100644
--- a/lib/ecdsa.js
+++ b/lib/ecdsa.js
@@ -13,11 +13,11 @@ var ECDSA = function ECDSA(obj) {
 };
 
 ECDSA.prototype.set = function(obj) {
-  this.hashbuf = obj.hashbuf || this.hashbuf || undefined;
-  this.keypair = obj.keypair || this.keypair || undefined;
-  this.sig = obj.sig || this.sig || undefined;
-  this.k = obj.k || this.k || undefined;
-  this.verified = obj.verified || this.verified || undefined;
+  this.hashbuf = obj.hashbuf || this.hashbuf;
+  this.keypair = obj.keypair || this.keypair;
+  this.sig = obj.sig || this.sig;
+  this.k = obj.k || this.k;
+  this.verified = obj.verified || this.verified;
   return this;
 };