diff --git a/src/mame/drivers/dps1.cpp b/src/mame/drivers/dps1.cpp
index 2aae2d023d4..93bf9775b78 100644
--- a/src/mame/drivers/dps1.cpp
+++ b/src/mame/drivers/dps1.cpp
@@ -17,6 +17,7 @@ ToDo:
 #include "machine/upd765.h"
 #include "machine/mc2661.h"
 #include "bus/rs232/rs232.h"
+//#include "bus/s100/s100.h"
 #include "softlist.h"
 
 class dps1_state : public driver_device
diff --git a/src/mame/drivers/sys2900.cpp b/src/mame/drivers/sys2900.cpp
index 00254cb2f5e..2693762f1c8 100644
--- a/src/mame/drivers/sys2900.cpp
+++ b/src/mame/drivers/sys2900.cpp
@@ -46,6 +46,7 @@ Status:
 #include "machine/z80ctc.h"
 #include "machine/z80pio.h"
 #include "machine/z80sio.h"
+//#include "bus/s100/s100.h"
 #include "screen.h"