diff --git a/lib/bip70/pk.js b/lib/bip70/pk.js
index 241e0359..d06de80b 100644
--- a/lib/bip70/pk.js
+++ b/lib/bip70/pk.js
@@ -99,7 +99,7 @@ rsa.decrypt = function decrypt(N, D, m) {
     throw new Error('Cannot decrypt.');
 
   return c
-    .toRed(bn.red(N))
+    .toRed(BN.red(N))
     .redPow(D)
     .fromRed()
     .toArrayLike(Buffer, 'be');
@@ -107,7 +107,7 @@ rsa.decrypt = function decrypt(N, D, m) {
 
 rsa.encrypt = function encrypt(N, e, m) {
   return new BN(m)
-    .toRed(bn.red(N))
+    .toRed(BN.red(N))
     .redPow(e)
     .fromRed()
     .toArrayLike(Buffer, 'be');