diff --git a/source/snes9x/fxemu.cpp b/source/snes9x/fxemu.cpp
index 7c02106..3fb012f 100644
--- a/source/snes9x/fxemu.cpp
+++ b/source/snes9x/fxemu.cpp
@@ -148,7 +148,7 @@ void S9xSuperFXExec (void)
 {
 	if ((Memory.FillRAM[0x3000 + GSU_SFR] & FLG_G) && (Memory.FillRAM[0x3000 + GSU_SCMR] & 0x18) == 0x18)
 	{
-		FxEmulate(((Memory.FillRAM[0x3000 + GSU_CLSR] & 1) ? SuperFX.speedPerLine * 2 : SuperFX.speedPerLine) * Settings.SuperFXClockMultiplier / 100);
+		FxEmulate(((Memory.FillRAM[0x3000 + GSU_CLSR] & 1) ? (SuperFX.speedPerLine * 8 / 3) : SuperFX.speedPerLine) * Settings.SuperFXClockMultiplier / 100);
 
 		uint16 GSUStatus = Memory.FillRAM[0x3000 + GSU_SFR] | (Memory.FillRAM[0x3000 + GSU_SFR + 1] << 8);
 		if ((GSUStatus & (FLG_G | FLG_IRQ)) == FLG_IRQ)