diff --git a/BizHawk.Client.Common/movie/bk2/Bk2Movie.HeaderApi.cs b/BizHawk.Client.Common/movie/bk2/Bk2Movie.HeaderApi.cs
index 92137a7cb5..ddc3e1b5da 100644
--- a/BizHawk.Client.Common/movie/bk2/Bk2Movie.HeaderApi.cs
+++ b/BizHawk.Client.Common/movie/bk2/Bk2Movie.HeaderApi.cs
@@ -67,7 +67,7 @@ namespace BizHawk.Client.Common
 			{
 				if (value)
 				{
-					Header.Add(HeaderKeys.STARTSFROMSAVESTATE, "True");
+					Header[HeaderKeys.STARTSFROMSAVESTATE] = "True";
 				}
 				else
 				{