diff --git a/stepmania/src/ScoreKeeperRave.cpp b/stepmania/src/ScoreKeeperRave.cpp
index 62bd12dd5d..0310017a70 100644
--- a/stepmania/src/ScoreKeeperRave.cpp
+++ b/stepmania/src/ScoreKeeperRave.cpp
@@ -77,6 +77,7 @@ void ScoreKeeperRave::AddSuperMeterDelta( float fUnscaledPercentChange )
 		case PLAYER_2:	fLifePercentage = 1 - GAMESTATE->m_fTugLifePercentP1;	break;
 		default:	ASSERT(0);
 		}
+		CLAMP( fLifePercentage, 0.f, 1.f );
 		if( fUnscaledPercentChange > 0 )
 			fUnscaledPercentChange *= SCALE( fLifePercentage, 0.f, 1.f, 1.7f, 0.3f);
 		else	// fUnscaledPercentChange <= 0