diff --git a/package.json b/package.json
index a49e8da..9516f80 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@mtillmann/chapters",
-  "version": "0.1.0",
+  "version": "0.1.1",
   "description": "library that manages and converts chapters of multiple formats",
   "main": "dist/index.js",
   "types": "dist/index.d.ts",
diff --git a/src/Formats/Base.ts b/src/Formats/Base.ts
index aabd455..57f73db 100644
--- a/src/Formats/Base.ts
+++ b/src/Formats/Base.ts
@@ -1,5 +1,5 @@
 import filenamify from 'filenamify'
-import { enforceMilliseconds, hash, secondsToTimestamp, toSeconds } from '../util'
+import { enforceMilliseconds, hash, secondsToTimestamp, toSeconds, Float } from '../util'
 import { type MediaItemMeta } from '../Types/MediaItemMeta'
 import { type Chapter } from '../Types/Chapter'
 import { type MediaItem } from '../Types/MediaItem'
@@ -31,7 +31,7 @@ export abstract class Base implements MediaItem {
   isChapterFormat: boolean = true
 
   constructor (duration: number = 3600) {
-    this.duration = duration
+    this.duration = Float(duration)
   }
 
   static create (input?: string | MediaItem, duration?: number): MediaItem {