diff --git a/package.json b/package.json
index 3f6437b..c28ccd4 100644
--- a/package.json
+++ b/package.json
@@ -40,6 +40,7 @@
   },
   "devDependencies": {
     "@types/glob-expand": "^0.0.30",
+    "@types/mkdirp": "^0.3.29",
     "@types/mocha": "^2.2.33",
     "@types/node": "^7.0.5",
     "@types/power-assert": "^1.4.29",
@@ -52,6 +53,7 @@
     "grunt-mocha-test": "^0.13.2",
     "grunt-tslint": "^4.0.1",
     "load-grunt-tasks": "^3.5.0",
+    "mkdirp": "^0.5.1",
     "mocha": "^3.0.2",
     "power-assert": "^1.4.2",
     "tslint": "^4.4.2",
diff --git a/test/indexSpec.ts b/test/indexSpec.ts
index 0ad5f97..d332c63 100644
--- a/test/indexSpec.ts
+++ b/test/indexSpec.ts
@@ -6,6 +6,7 @@ import fs = require("fs");
 import path = require("path");
 import childProcess = require("child_process");
 import stream = require("stream");
+import mkdirp = require("mkdirp");
 
 import lib = require("../lib/");
 
@@ -127,6 +128,7 @@ describe("tsfmt test", () => {
                             // console.log(fileName, expectedFileName);
 
                             if (!fs.existsSync(expectedTsFileName)) {
+                                mkdirp.sync(path.dirname(expectedTsFileName));
                                 fs.writeFileSync(expectedTsFileName, result.dest);
                             }