diff --git a/Core/HW/SasAudio.cpp b/Core/HW/SasAudio.cpp
index f0050ee8e3..84679b58b2 100644
--- a/Core/HW/SasAudio.cpp
+++ b/Core/HW/SasAudio.cpp
@@ -706,7 +706,7 @@ void ADSREnvelope::WalkCurve(int type) {
 	case PSP_SAS_ADSR_CURVE_MODE_EXPONENT_DECREASE:
 		expDelta = height_ - PSP_SAS_ENVELOPE_HEIGHT_MAX;
 		expDelta -= (expDelta * (s64)rate_) / 0x100000000LL;
-		height_ = expDelta + PSP_SAS_ENVELOPE_HEIGHT_MAX - (rate_ + 3) / 4;
+		height_ = expDelta + PSP_SAS_ENVELOPE_HEIGHT_MAX - ((u32)rate_ + 3UL) / 4UL;
 		break;
 
 	case PSP_SAS_ADSR_CURVE_MODE_EXPONENT_INCREASE: