diff --git a/src/mame/machine/315-5338a.h b/src/mame/machine/315-5338a.h
index 71d289e2255..870c4ba2ead 100644
--- a/src/mame/machine/315-5338a.h
+++ b/src/mame/machine/315-5338a.h
@@ -20,6 +20,7 @@
 
 #pragma once
 
+#include "emu.h"
 
 //**************************************************************************
 //  INTERFACE CONFIGURATION MACROS