diff --git a/src/mame/drivers/ksys573.c b/src/mame/drivers/ksys573.c
index 0616a3181f6..bbf25e37e50 100644
--- a/src/mame/drivers/ksys573.c
+++ b/src/mame/drivers/ksys573.c
@@ -461,7 +461,7 @@ INLINE void ATTR_PRINTF(3,4) verboselog( running_machine &machine, int n_level,
 	}
 }
 
-static const char *const diskregions[] = { "cdrom0", "cdrom1" };
+static const char *const diskregions[] = { ":cdrom0", ":cdrom1" };
 
 static WRITE32_HANDLER( mb89371_w )
 {