diff --git a/packages/xo-server/src/xo-mixins/jobs/index.js b/packages/xo-server/src/xo-mixins/jobs/index.js
index 8a35ea778..cd7611511 100644
--- a/packages/xo-server/src/xo-mixins/jobs/index.js
+++ b/packages/xo-server/src/xo-mixins/jobs/index.js
@@ -90,10 +90,7 @@ const normalize = job => {
 
 const serialize = (job: {| [string]: any |}) => {
   Object.keys(job).forEach(key => {
-    const value = job[key]
-    if (typeof value !== 'string') {
-      job[key] = JSON.stringify(job[key])
-    }
+    job[key] = JSON.stringify(job[key])
   })
   return job
 }