diff --git a/index.js b/index.js
index 7e1c260..1b70880 100644
--- a/index.js
+++ b/index.js
@@ -5,6 +5,7 @@ var crypto = require("crypto")
 var fs = require("fs")
 var findCacheDir = require("find-cache-dir")
 var objectHash = require("object-hash")
+var os = require("os")
 
 var engines = {}
 var cache = null
@@ -165,7 +166,7 @@ module.exports = function(input, map) {
         thunk: true,
         create: true,
       })
-      cachePath = thunk("data.json")
+      cachePath = thunk("data.json") || os.tmpdir() + '/data.json';
       try {
         cache = require(cachePath)
       }