diff --git a/src/mame/drivers/stlforce.cpp b/src/mame/drivers/stlforce.cpp
index 5dd6e2ae888..196684e83f1 100644
--- a/src/mame/drivers/stlforce.cpp
+++ b/src/mame/drivers/stlforce.cpp
@@ -210,7 +210,7 @@ static MACHINE_CONFIG_START( stlforce, stlforce_state )
 	/* sound hardware */
 	MCFG_SPEAKER_STANDARD_MONO("mono")
 
-	MCFG_OKIM6295_ADD("oki", 937500 , OKIM6295_PIN7_HIGH)
+	MCFG_OKIM6295_ADD("oki", XTAL_32MHz/32 , OKIM6295_PIN7_HIGH)
 	MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 1.0)
 MACHINE_CONFIG_END