diff --git a/src/mame/drivers/namcos22.c b/src/mame/drivers/namcos22.c
index 9ffe82b9d5a..7b6693582d0 100644
--- a/src/mame/drivers/namcos22.c
+++ b/src/mame/drivers/namcos22.c
@@ -4684,8 +4684,8 @@ ROM_START( dirtdash )
         ROM_LOAD( "dt1ptru2.15f", 0x400000, 0x080000, CRC(1171eaf5) SHA1(168365ea619386f218585c49025cdd7fd1224082) )
 
 	ROM_REGION( 0x1000000, "c352", 0 ) /* sound samples */
-        ROM_LOAD( "dt1wavea.2l",  0x000000, 0x400000, CRC(14352455) SHA1(1965ea6e5ce1b2187ecb64bd40ff044f4b2ba5f6) )
-        ROM_LOAD( "dt1waveb.1l",  0x400000, 0x400000, CRC(16a4dd8a) SHA1(4883b7ba3ee08a2893d4b2918640ba44e7147164) )
+        ROM_LOAD( "dt1wavea.2l",  0x000000, 0x400000, CRC(cbd52e40) SHA1(dc995dd919548c96a90efb0375e5b5f1055e05cb) )
+        ROM_LOAD( "dt1waveb.1l",  0x400000, 0x400000, CRC(6b736f94) SHA1(ac3715480aa9a9c2dec099607f89859bb3b73a6a) )
 ROM_END
 
 ROM_START( aquajet )