diff --git a/src/cli.ts b/src/cli.ts
index 33ca998..22648c3 100644
--- a/src/cli.ts
+++ b/src/cli.ts
@@ -1,6 +1,6 @@
 'use strict';
 import batch = require('./batch');
 
-batch(process.argv, err => {
-  if (err) console.error(err);
+batch(process.argv, (err: any) => {
+  if (err) console.error(err.stack || err);
 });
\ No newline at end of file
diff --git a/src/subtitle/decode.ts b/src/subtitle/decode.ts
index 1773bb1..9474bde 100644
--- a/src/subtitle/decode.ts
+++ b/src/subtitle/decode.ts
@@ -2,6 +2,7 @@
 'use strict';
 export = main;
 import crypto = require('crypto');
+import bigInt = require('big-integer');
 import zlib = require('zlib');
 
 /**