diff --git a/src/BizHawk.Emulation.Cores/Consoles/Nintendo/BSNES/BsnesCore.IEmulator.cs b/src/BizHawk.Emulation.Cores/Consoles/Nintendo/BSNES/BsnesCore.IEmulator.cs
index 900ebe3067..02668bd7d0 100644
--- a/src/BizHawk.Emulation.Cores/Consoles/Nintendo/BSNES/BsnesCore.IEmulator.cs
+++ b/src/BizHawk.Emulation.Cores/Consoles/Nintendo/BSNES/BsnesCore.IEmulator.cs
@@ -34,6 +34,7 @@ namespace BizHawk.Emulation.Cores.Nintendo.BSNES
 				IsLagFrame = true;
 				// run the core for one frame
 				Api.core.snes_run(false);
+				AdvanceRtc();
 				FrameAdvancePost();
 
 				return true;
@@ -55,7 +56,6 @@ namespace BizHawk.Emulation.Cores.Nintendo.BSNES
 			int numSamples = UpdateAudioBuffer();
 			_soundProvider.PutSamples(_audioBuffer, numSamples / 2);
 			Frame++;
-			AdvanceRtc();
 
 			if (IsLagFrame)
 			{
diff --git a/src/BizHawk.Emulation.Cores/Consoles/Nintendo/BSNES/BsnesCore.cs b/src/BizHawk.Emulation.Cores/Consoles/Nintendo/BSNES/BsnesCore.cs
index b4556b7542..4e4c748aea 100644
--- a/src/BizHawk.Emulation.Cores/Consoles/Nintendo/BSNES/BsnesCore.cs
+++ b/src/BizHawk.Emulation.Cores/Consoles/Nintendo/BSNES/BsnesCore.cs
@@ -348,10 +348,10 @@ namespace BizHawk.Emulation.Cores.Nintendo.BSNES
 		private long _clockTime;
 		private int _clockRemainder;
 
-		protected void InitializeRtc(DateTime start)
+		private void InitializeRtc(DateTime start)
 			=> _clockTime = (long)(start - _epoch).TotalSeconds;
 
-		private void AdvanceRtc()
+		internal void AdvanceRtc()
 		{
 			_clockRemainder += VsyncDenominator;
 			if (_clockRemainder >= VsyncNumerator)
diff --git a/src/BizHawk.Emulation.Cores/Consoles/Nintendo/BSNES/SubBsnesCore.cs b/src/BizHawk.Emulation.Cores/Consoles/Nintendo/BSNES/SubBsnesCore.cs
index 35b5a9a3ef..f84cf5c905 100644
--- a/src/BizHawk.Emulation.Cores/Consoles/Nintendo/BSNES/SubBsnesCore.cs
+++ b/src/BizHawk.Emulation.Cores/Consoles/Nintendo/BSNES/SubBsnesCore.cs
@@ -81,6 +81,7 @@ namespace BizHawk.Emulation.Cores.Nintendo.BSNES
 				}
 
 				if (!framePassed) _bsnesCore.IsLagFrame = false;
+				if (framePassed) _bsnesCore.AdvanceRtc();
 				_bsnesCore.FrameAdvancePost();
 
 				return true;