diff --git a/lib/elliptic/ec/index.js b/lib/elliptic/ec/index.js
index 8b58781..a1f4515 100644
--- a/lib/elliptic/ec/index.js
+++ b/lib/elliptic/ec/index.js
@@ -223,7 +223,7 @@ EC.prototype.recoverPubKey = function(msg, signature, j, enc) {
   return this.g.mulAdd(s1, r, s2);
 };
 
-EC.prototype.getKeyRecoveryParam = function(e, signature, Q, enc) {
+EC.prototype.getKeyRecoveryParam = function(msg, signature, Q, enc) {
   signature = new Signature(signature, enc);
   if (signature.recoveryParam !== null)
     return signature.recoveryParam;
@@ -231,7 +231,7 @@ EC.prototype.getKeyRecoveryParam = function(e, signature, Q, enc) {
   for (var i = 0; i < 4; i++) {
     var Qprime;
     try {
-      Qprime = this.recoverPubKey(e, signature, i);
+      Qprime = this.recoverPubKey(msg, signature, i);
     } catch (e) {
       continue;
     }