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-rw-r--r--src/mame/audio/nichisnd.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/mame/audio/nichisnd.h b/src/mame/audio/nichisnd.h
index c4693bfb689..6343a3832dd 100644
--- a/src/mame/audio/nichisnd.h
+++ b/src/mame/audio/nichisnd.h
@@ -14,6 +14,7 @@
#include "cpu/z80/tmpz84c011.h"
#include "sound/3812intf.h"
#include "sound/dac.h"
+#include "sound/volt_reg.h"
#include "speaker.h"
#include "machine/gen_latch.h"