diff --git a/src/modules/5s/utils.ts b/src/modules/5s/utils.ts
index 650c6e2..a1c350e 100644
--- a/src/modules/5s/utils.ts
+++ b/src/modules/5s/utils.ts
@@ -18,7 +18,7 @@ export const toDuration = (startDate: Date, endDate: Date = new Date()) => {
     parts.push(`${minutes}m`)
   }
 
-  parts.push(`${seconds}s`)
+  parts.push(`${seconds}s`.padStart(3, '0'))
 
   return parts.join(' ')
 }