diff --git a/src/BizHawk.Client.Common/movie/tasproj/TasMovie.IO.cs b/src/BizHawk.Client.Common/movie/tasproj/TasMovie.IO.cs
index 2dfdc9dd5f..05edfedfed 100644
--- a/src/BizHawk.Client.Common/movie/tasproj/TasMovie.IO.cs
+++ b/src/BizHawk.Client.Common/movie/tasproj/TasMovie.IO.cs
@@ -12,6 +12,19 @@ namespace BizHawk.Client.Common
 
 		protected override void Write(string fn, bool isBackup = false)
 		{
+			if (Emulator is Emulation.Cores.Nintendo.SubNESHawk.SubNESHawk subNes)
+			{
+				Header[HeaderKeys.VBlankCount] = subNes.VblankCount.ToString();
+			}
+			else if (Emulator is Emulation.Cores.Nintendo.Gameboy.Gameboy gameboy)
+			{
+				Header[HeaderKeys.CycleCount] = gameboy.CycleCount.ToString();
+			}
+			else if (Emulator is Emulation.Cores.Nintendo.SubGBHawk.SubGBHawk subGb)
+			{
+				Header[HeaderKeys.CycleCount] = subGb.CycleCount.ToString();
+			}
+
 			var file = new FileInfo(fn);
 			if (file.Directory != null && !file.Directory.Exists)
 			{