diff --git a/stepmania/src/StyleDef.cpp b/stepmania/src/StyleDef.cpp
index 2e4228fbd2..45cafd0862 100644
--- a/stepmania/src/StyleDef.cpp
+++ b/stepmania/src/StyleDef.cpp
@@ -37,7 +37,7 @@ void StyleDef::GetTransformedNoteDataForStyle( PlayerNumber pn, const NoteData*
 }
 
 
-GameInput StyleDef::StyleInputToGameInput( const StyleInput StyleI ) const
+GameInput StyleDef::StyleInputToGameInput( const StyleInput& StyleI ) const
 {
 	ASSERT_M( StyleI.player < NUM_PLAYERS, ssprintf("P%i", StyleI.player) );
 	ASSERT_M( StyleI.col < MAX_COLS_PER_PLAYER, ssprintf("C%i", StyleI.col) );
diff --git a/stepmania/src/StyleDef.h b/stepmania/src/StyleDef.h
index 41722e5f75..ee09bfd2b5 100644
--- a/stepmania/src/StyleDef.h
+++ b/stepmania/src/StyleDef.h
@@ -50,7 +50,7 @@ public:
 	ColumnInfo	m_ColumnInfo[NUM_PLAYERS][MAX_COLS_PER_PLAYER];	// maps each players' column to a track in the NoteData
 	int			m_iColumnDrawOrder[MAX_COLS_PER_PLAYER];
 
-	GameInput StyleInputToGameInput( const StyleInput StyleI ) const;
+	GameInput StyleInputToGameInput( const StyleInput& StyleI ) const;
 	StyleInput GameInputToStyleInput( const GameInput &GameI ) const;
 
 	PlayerNumber ControllerToPlayerNumber( GameController controller ) const;