diff --git a/src/mame/drivers/cps2.cpp b/src/mame/drivers/cps2.cpp
index c722378fdbd..ac14acddb64 100644
--- a/src/mame/drivers/cps2.cpp
+++ b/src/mame/drivers/cps2.cpp
@@ -625,14 +625,14 @@ Stephh's inputs notes (based on some tests on the "parent" set) :
 ***************************************************************************/
 
 #include "emu.h"
+#include "includes/cps1.h"
+#include "machine/cps2crypt.h"
 #include "cpu/z80/z80.h"
 #include "machine/eepromser.h"
 #include "cpu/m68000/m68000.h"
 #include "sound/qsound.h"
 #include "sound/okim6295.h"
 
-#include "includes/cps1.h" // External CPS1 definitions
-
 
 /*************************************
  *
diff --git a/src/mame/machine/cps2crypt.h b/src/mame/machine/cps2crypt.h
new file mode 100644
index 00000000000..c0c094aa546
--- /dev/null
+++ b/src/mame/machine/cps2crypt.h
@@ -0,0 +1,7 @@
+// license:BSD-3-Clause
+// copyright-holders:Paul Leaman, Andreas Naive, Nicola Salmoria,Charles MacDonald
+/******************************************************************************
+
+CPS-2 Encryption
+
+*/