diff --git a/src/BizHawk.Client.Common/movie/import/bkm/BkmHeader.cs b/src/BizHawk.Client.Common/movie/import/bkm/BkmHeader.cs
index 835aa352f4..a1d5d0d362 100644
--- a/src/BizHawk.Client.Common/movie/import/bkm/BkmHeader.cs
+++ b/src/BizHawk.Client.Common/movie/import/bkm/BkmHeader.cs
@@ -7,18 +7,15 @@ namespace BizHawk.Client.Common
 	{
 		public BkmHeader()
 		{
-			Comments = new List<string>();
-			Subtitles = new SubtitleList();
-
 			this[HeaderKeys.EmulationVersion] = VersionInfo.GetEmuVersion();
-			this[HeaderKeys.Platform] = Global.Emulator != null ? Global.Emulator.SystemId : "";
 			this[HeaderKeys.GameName] = "";
 			this[HeaderKeys.Author] = "";
 			this[HeaderKeys.Rerecords] = "0";
+			this[HeaderKeys.MovieVersion] = "BizHawk v0.0.1";
 		}
 
-		public List<string> Comments { get; }
-		public SubtitleList Subtitles { get; }
+		public List<string> Comments { get; } = new List<string>();
+		public SubtitleList Subtitles { get; } = new SubtitleList();
 
 		public string SavestateBinaryBase64Blob
 		{
diff --git a/src/BizHawk.Client.Common/movie/import/bkm/BkmMovie.cs b/src/BizHawk.Client.Common/movie/import/bkm/BkmMovie.cs
index 957308e2ed..1a9273d6b0 100644
--- a/src/BizHawk.Client.Common/movie/import/bkm/BkmMovie.cs
+++ b/src/BizHawk.Client.Common/movie/import/bkm/BkmMovie.cs
@@ -9,14 +9,9 @@ namespace BizHawk.Client.Common
 		private readonly List<string> _log = new List<string>();
 		private int? _loopOffset;
 
-		public BkmMovie()
-		{
-			Header = new BkmHeader { [HeaderKeys.MovieVersion] = "BizHawk v0.0.1" };
-		}
-
 		public string PreferredExtension => "bkm";
 
-		public BkmHeader Header { get; }
+		public BkmHeader Header { get; } = new BkmHeader();
 		public string Filename { get; set; } = "";
 		public bool Loaded { get; private set; }