diff --git a/types/bip32/index.d.ts b/types/bip32/index.d.ts
index 99a1b8dffd..c536f741af 100644
--- a/types/bip32/index.d.ts
+++ b/types/bip32/index.d.ts
@@ -17,6 +17,7 @@ export class BIP32 {
 
     identifier: Buffer;
     fingerprint: Buffer;
+    chainCode: Buffer;
     privateKey: Buffer;
     publicKey: Buffer;