diff --git a/src/mame/drivers/hp2640.cpp b/src/mame/drivers/hp2640.cpp
index 02ca96c4e2d..c2f67493fb4 100644
--- a/src/mame/drivers/hp2640.cpp
+++ b/src/mame/drivers/hp2640.cpp
@@ -678,4 +678,4 @@ ROM_START(hp2645)
 	ROM_LOAD("1816-0613.bin", 0x0400, 0x400, CRC(b6bac431) SHA1(42a557ecff769425d295ebbd1b73b26ddbfd3a09))
 ROM_END
 
-COMP(1976 , hp2645 , 0 , 0 , hp2645 , hp2645 , hp2645_state , 0 , "HP" , "HP 2645A" , 0)
+COMP(1976 , hp2645 , 0 , 0 , hp2645 , hp2645 , hp2645_state , 0 , "HP" , "HP 2645A" , MACHINE_NO_SOUND)