diff --git a/lib/middlewares/common.js b/lib/middlewares/common.js
index 4a09c5a..4645b6d 100644
--- a/lib/middlewares/common.js
+++ b/lib/middlewares/common.js
@@ -12,6 +12,7 @@ module.exports = function common(req, res, next) {
 
     logger.info(`Got request from ${res.locals.httpgetx_subsystem === 'CORE-CALLBACK' ? 'CORE' : 'PARTNER'}`, {
         xid: res.locals.xid,
+        pid: process.pid,
         requester_ip: req.ip,
         method: req.method,
         path: req.path,