diff --git a/src/BizHawk.Emulation.Cores/Consoles/NEC/PCE/TerboGrafixSanic.cs b/src/BizHawk.Emulation.Cores/Consoles/NEC/PCE/TerboGrafixSanic.cs
index 21ea15c075..870c98103a 100644
--- a/src/BizHawk.Emulation.Cores/Consoles/NEC/PCE/TerboGrafixSanic.cs
+++ b/src/BizHawk.Emulation.Cores/Consoles/NEC/PCE/TerboGrafixSanic.cs
@@ -47,6 +47,10 @@ namespace BizHawk.Emulation.Cores.Consoles.NEC.PCE
 			{ "nyma.rtcinitialtime", null },
 			{ "nyma.rtcrealtime", null },
 		};
+		protected override ISet<string> NonSyncSettingNames { get; } = new HashSet<string>
+		{
+			"pce_fast.slstart", "pce_fast.slend",
+		};
 
 		protected override IDictionary<string, string> ButtonNameOverrides { get; } = new Dictionary<string, string>
 		{