diff --git a/src/BizHawk.Client.Common/rewind/Rewinder.cs b/src/BizHawk.Client.Common/rewind/Rewinder.cs
index b6e70193a4..2cb1e4efd7 100644
--- a/src/BizHawk.Client.Common/rewind/Rewinder.cs
+++ b/src/BizHawk.Client.Common/rewind/Rewinder.cs
@@ -4,7 +4,22 @@ using BizHawk.Emulation.Common;
 
 namespace BizHawk.Client.Common
 {
-	public class Rewinder : IDisposable
+	public interface IRewinder : IDisposable
+	{
+		int Count { get; }
+		bool HasBuffer { get; }
+		float FullnessRatio { get; }
+		long Size { get; }
+		int RewindFrequency { get; }
+
+		bool RewindActive { get; }
+		bool SuspendRewind { get; set; }
+
+		void Capture(int frame);
+		bool Rewind(int frames);
+	}
+
+	public class Rewinder : IRewinder
 	{
 		private readonly IStatable _statableCore;
 
diff --git a/src/BizHawk.Client.EmuHawk/MainForm.cs b/src/BizHawk.Client.EmuHawk/MainForm.cs
index 4e74562bbf..291c0bf17f 100644
--- a/src/BizHawk.Client.EmuHawk/MainForm.cs
+++ b/src/BizHawk.Client.EmuHawk/MainForm.cs
@@ -896,7 +896,7 @@ namespace BizHawk.Client.EmuHawk
 		private Sound Sound => GlobalWin.Sound;
 		public CheatCollection CheatList => GlobalWin.CheatList;
 
-		public Rewinder Rewinder { get; set; }
+		public IRewinder Rewinder { get; set; }
 
 		private FirmwareManager FirmwareManager => GlobalWin.FirmwareManager;