diff --git a/src/babel/api/node.js b/src/babel/api/node.js
index 8923446029..17bba24090 100644
--- a/src/babel/api/node.js
+++ b/src/babel/api/node.js
@@ -53,7 +53,7 @@ export function transformFile(filename: string, opts?: Object, callback: Functio
 
 export function transformFileSync(filename: string, opts?: Object = {}) {
   opts.filename = filename;
-  return transform(fs.readFileSync(filename), opts);
+  return transform(fs.readFileSync(filename, "utf8"), opts);
 }
 
 export function parse(code, opts = {}) {
diff --git a/src/babel/transformation/file/index.js b/src/babel/transformation/file/index.js
index f0b8861ad8..bec58c718a 100644
--- a/src/babel/transformation/file/index.js
+++ b/src/babel/transformation/file/index.js
@@ -480,6 +480,8 @@ export default class File {
   }
 
   wrap(code, callback) {
+    code = code + "";
+
     try {
       if (this.shouldIgnore()) {
         return {