diff --git a/src/BizHawk.Emulation.Cores/Waterbox/NymaCore.Controller.cs b/src/BizHawk.Emulation.Cores/Waterbox/NymaCore.Controller.cs
index a30de81703..0dc562840a 100644
--- a/src/BizHawk.Emulation.Cores/Waterbox/NymaCore.Controller.cs
+++ b/src/BizHawk.Emulation.Cores/Waterbox/NymaCore.Controller.cs
@@ -305,9 +305,9 @@ namespace BizHawk.Emulation.Cores.Waterbox
 								// so these thunks are called after the frame has advanced
 								_rumblers.Add((c, b) =>
 								{
-									const double S32_MAX_AS_F64 = int.MaxValue;
+									const double SCALE_FACTOR = (double) int.MaxValue / (double) byte.MaxValue;
 									static int Scale(byte b)
-										=> (b * S32_MAX_AS_F64).RoundToInt();
+										=> (b * SCALE_FACTOR).RoundToInt();
 									//TODO double-check order
 									c.SetHapticChannelStrength(nameRight, Scale(b[byteStart]));
 									c.SetHapticChannelStrength(nameLeft, Scale(b[byteStart + 1]));