diff --git a/@vates/parse-duration/index.js b/@vates/parse-duration/index.js
index ac7137792..c026343ba 100644
--- a/@vates/parse-duration/index.js
+++ b/@vates/parse-duration/index.js
@@ -6,7 +6,7 @@ exports.parseDuration = value => {
   }
   const duration = ms(value)
   if (duration === undefined) {
-    throw new TypeError(`not a valid duration: ${duration}`)
+    throw new TypeError(`not a valid duration: ${value}`)
   }
   return duration
 }