diff --git a/lib/bitcoind.js b/lib/bitcoind.js
index 42f46b8f..d7fa8714 100644
--- a/lib/bitcoind.js
+++ b/lib/bitcoind.js
@@ -814,8 +814,8 @@ Wallet.prototype.dumpKey = function(options) {
   return bitcoindjs.walletDumpKey(options || {});
 };
 
-Wallet.prototype.importKey = function(options) {
-  return bitcoindjs.walletImportKey(options || {});
+Wallet.prototype.importKey = function(options, callback) {
+  return bitcoindjs.walletImportKey(options || {}, callback);
 };
 
 Wallet.prototype.keyPoolRefill = function(options) {