diff --git a/index.js b/index.js
index 1fd5a35..6b78dbd 100644
--- a/index.js
+++ b/index.js
@@ -2,7 +2,7 @@
 
 process.chdir(__dirname);
 const fs = require('fs');
-fs.writeFileSync('pid.txt', process.pid);
+fs.writeFileSync('pid.txt', process.pid.toString());
 
 const config = require('komodo-sdk/config');