diff --git a/src/filesystem/implementation.js b/src/filesystem/implementation.js
index 99e5363..74fc84d 100644
--- a/src/filesystem/implementation.js
+++ b/src/filesystem/implementation.js
@@ -1871,7 +1871,7 @@ function appendFile(fs, context, path, data, options, callback) {
     return callback(new Errors.EINVAL('flags is not valid', path));
   }
   
-  if (typeof options ==== 'object') {
+  if (typeof options === 'object') {
     if (options.encoding === undefined) {
       options.encoding = 'utf8';
     }