diff --git a/FFMpegCore/FFMpeg/Builders/MetaData/MetaDataBuilder.cs b/FFMpegCore/FFMpeg/Builders/MetaData/MetaDataBuilder.cs
index 7409543..8c7360b 100644
--- a/FFMpegCore/FFMpeg/Builders/MetaData/MetaDataBuilder.cs
+++ b/FFMpegCore/FFMpeg/Builders/MetaData/MetaDataBuilder.cs
@@ -88,7 +88,7 @@ public MetaDataBuilder AddChapter(TimeSpan duration, string? title = null)
 
         public ReadOnlyMetaData Build()
         {
-            return new MetaData(_metaData);
+            return new ReadOnlyMetaData(_metaData);
         }
     }
 }
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