diff --git a/BizHawk.Client.EmuHawk/AVOut/AVSync.cs b/BizHawk.Client.EmuHawk/AVOut/AVSync.cs
index da7fe6fe2e..70686cf0ba 100644
--- a/BizHawk.Client.EmuHawk/AVOut/AVSync.cs
+++ b/BizHawk.Client.EmuHawk/AVOut/AVSync.cs
@@ -7,6 +7,7 @@ using BizHawk.Emulation.Common;
 
 namespace BizHawk.Client.EmuHawk
 {
+	[VideoWriterIgnore]
 	public class AudioStretcher : AVStretcher
 	{
 		public AudioStretcher(IVideoWriter w)
@@ -39,6 +40,7 @@ namespace BizHawk.Client.EmuHawk
 		}
 	}
 
+	[VideoWriterIgnore]
 	public class VideoStretcher : AVStretcher
 	{
 		public VideoStretcher(IVideoWriter w)