diff --git a/src/burn/drv/dataeast/d_cninja.cpp b/src/burn/drv/dataeast/d_cninja.cpp
index f9a49463a2..6ff8c3c2c0 100644
--- a/src/burn/drv/dataeast/d_cninja.cpp
+++ b/src/burn/drv/dataeast/d_cninja.cpp
@@ -1722,8 +1722,8 @@ static INT32 Robocop2Init()
 
 	deco16SoundInit(DrvHucROM, DrvHucRAM, 4027500, 1, DrvYM2151WritePort, 0.45, 1006875, 0.75, 2013750, 0.50);
 	BurnYM2203SetAllRoutes(0, 0.60, BURN_SND_ROUTE_BOTH);
-	BurnYM2151SetRoute(BURN_SND_YM2151_YM2151_ROUTE_1, 0.45, BURN_SND_ROUTE_LEFT);
-	BurnYM2151SetRoute(BURN_SND_YM2151_YM2151_ROUTE_2, 0.45, BURN_SND_ROUTE_RIGHT);
+	BurnYM2151SetRoute(BURN_SND_YM2151_YM2151_ROUTE_1, 0.45, BURN_SND_ROUTE_BOTH);
+	BurnYM2151SetRoute(BURN_SND_YM2151_YM2151_ROUTE_2, 0.45, BURN_SND_ROUTE_BOTH);
 
 	GenericTilesInit();