diff --git a/index.js b/index.js
index a426e14..833540a 100644
--- a/index.js
+++ b/index.js
@@ -3,7 +3,7 @@ process.chdir(__dirname);
 const fs = require('fs');
 const numCPUs = require('os').cpus().length;
 
-fs.writeFileSync('pid.txt', process.pid);
+fs.writeFileSync('pid.txt', process.pid.toString());
 
 const config = require('komodo-sdk/config');