diff --git a/lib/secrets.js b/lib/secrets.js
index c7080dd..6b6529f 100644
--- a/lib/secrets.js
+++ b/lib/secrets.js
@@ -39,7 +39,7 @@ export default class Secrets extends Now {
         method: 'POST',
         body: {
           name,
-          value
+          value: value.toString()
         }
       });
       if (this._debug) console.timeEnd(`> [debug] #${attempt} POST /secrets`);