diff --git a/nisa32.js b/nisa32.js
index 02d90c1..7efd3f7 100644
--- a/nisa32.js
+++ b/nisa32.js
@@ -1,6 +1,7 @@
 var ref = require('ref');
 var ffi = require('ffi');
 var ArrayType = require('ref-array');
+var assert = require("assert");
 
 
 // typedef
@@ -33,9 +34,11 @@ function nisa32() {
 }
 */
 
-exports.query = function (visaAddress, queryString, callback){
-	return nisaQuery(visaAddress, queryString, callback);
-};
+module.exports = {
+	query: function (visaAddress, queryString, callback){
+		return nisaQuery(visaAddress, queryString, callback);
+	}
+}
 
 function nisaQuery(visaAddress, queryString, callback){
 	assert.equal(typeof (visaAddress), 'string', "argument 'visaAddress' must be a string");
diff --git a/package.json b/package.json
index 4894173..f04895d 100644
--- a/package.json
+++ b/package.json
@@ -23,13 +23,16 @@
   "homepage": "https://github.com/samofab/node-nisa32#readme",
   "devDependencies": {
     "express": "^4.13.3",
-	"http": "0.0.0",
+    "http": "0.0.0",
     "socket.io": "^1.3.6"
   },
   "dependencies": {
+    "assert": "^1.3.0",
     "ffi": "^1.3.2",
     "ref": "^1.0.2",
     "ref-array": "^1.1.1"
   },
-  "files": ["nisa32.js"]
+  "files": [
+    "nisa32.js"
+  ]
 }