diff --git a/stepmania/src/RageUtil.cpp b/stepmania/src/RageUtil.cpp
index bbc6c16bf0..8579c72bad 100644
--- a/stepmania/src/RageUtil.cpp
+++ b/stepmania/src/RageUtil.cpp
@@ -41,7 +41,7 @@ int RandomGen::operator() ( int maximum )
 
 void fapproach( float& val, float other_val, float to_move )
 {
-	ASSERT( to_move >= 0 );
+	RAGE_ASSERT_M( to_move >= 0, ssprintf("to_move: %f", to_move) );
 	if( val == other_val )
 		return;
 	float fDelta = other_val - val;