diff --git a/stepmania/src/ReceptorArrowRow.cpp b/stepmania/src/ReceptorArrowRow.cpp
index 9b00248b47..d32b1521df 100644
--- a/stepmania/src/ReceptorArrowRow.cpp
+++ b/stepmania/src/ReceptorArrowRow.cpp
@@ -43,6 +43,7 @@ void ReceptorArrowRow::Update( float fDeltaTime )
 		
 		// m_fDark==1 or m_fFadeToFailPercent==1 should make fBaseAlpha==0
 		float fBaseAlpha = (1 - m_pPlayerState->m_CurrentPlayerOptions.m_fDark) * (1 - m_fFadeToFailPercent);
+		CLAMP( fBaseAlpha, 0.0f, 1.0f );
 		m_ReceptorArrow[c].SetBaseAlpha( fBaseAlpha );
 
 		// set arrow XYZ