diff --git a/src/BizHawk.Client.Common/movie/bk2/Bk2Movie.IO.cs b/src/BizHawk.Client.Common/movie/bk2/Bk2Movie.IO.cs
index 8ac524dde6..32977a366e 100644
--- a/src/BizHawk.Client.Common/movie/bk2/Bk2Movie.IO.cs
+++ b/src/BizHawk.Client.Common/movie/bk2/Bk2Movie.IO.cs
@@ -51,19 +51,15 @@ namespace BizHawk.Client.Common
 		public void SetCycleValues() //TODO IEmulator should not be an instance prop of movies, it should be passed in to every call (i.e. from MovieService) --yoshi
 		{
 			// The saved cycle value will only be valid if the end of the movie has been emulated.
-			if (this.IsAtEnd())
+			if (this.IsAtEnd() && Emulator.AsCycleTiming() is { } cycleCore)
 			{
-				var cycleCore = Emulator.AsCycleTiming();
-				if (cycleCore != null)
-				{
-					Header[HeaderKeys.CycleCount] = cycleCore.CycleCount.ToString();
-					Header[HeaderKeys.ClockRate] = cycleCore.ClockRate.ToString(CultureInfo.InvariantCulture);
-				}
+				// legacy movies may incorrectly have no ClockRate header value set
+				Header[HeaderKeys.ClockRate] = cycleCore.ClockRate.ToString(NumberFormatInfo.InvariantInfo);
+				Header[HeaderKeys.CycleCount] = cycleCore.CycleCount.ToString();
 			}
 			else
 			{
-				Header.Remove(HeaderKeys.CycleCount);
-				Header.Remove(HeaderKeys.ClockRate);
+				Header.Remove(HeaderKeys.CycleCount); // don't allow invalid cycle count fields to stay set
 			}
 		}
 
diff --git a/src/BizHawk.Client.EmuHawk/MainForm.Movie.cs b/src/BizHawk.Client.EmuHawk/MainForm.Movie.cs
index e3bbcd687d..dcf0e287f3 100644
--- a/src/BizHawk.Client.EmuHawk/MainForm.Movie.cs
+++ b/src/BizHawk.Client.EmuHawk/MainForm.Movie.cs
@@ -1,4 +1,5 @@
 using System.Collections.Generic;
+using System.Globalization;
 using System.Windows.Forms;
 
 using BizHawk.Client.Common;
@@ -279,8 +280,7 @@ namespace BizHawk.Client.EmuHawk
 
 			if (Emulator.HasCycleTiming())
 			{
-				movie.HeaderEntries.Add(HeaderKeys.CycleCount, "0");
-				movie.HeaderEntries.Add(HeaderKeys.ClockRate, "0");
+				movie.HeaderEntries.Add(HeaderKeys.ClockRate, Emulator.AsCycleTiming().ClockRate.ToString(NumberFormatInfo.InvariantInfo));
 			}
 		}
 	}