diff --git a/lib/pem.js b/lib/pem.js
index 72f320c7..db147fc7 100644
--- a/lib/pem.js
+++ b/lib/pem.js
@@ -74,7 +74,7 @@ function createPrivateKey(keyBitsize, options, callback) {
 
     execOpenSSL(params, 'RSA PRIVATE KEY', function(error, key) {
         if(clientKeyPassword) {
-            fs.unlink(clientKeyPassword);
+            fs.unlink(clientKeyPassword, function() {});
         }
         if (error) {
             return callback(error);