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-rw-r--r--src/mame/audio/bzone.cpp3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/mame/audio/bzone.cpp b/src/mame/audio/bzone.cpp
index daf378e8577..84d4d5d6cf1 100644
--- a/src/mame/audio/bzone.cpp
+++ b/src/mame/audio/bzone.cpp
@@ -25,6 +25,9 @@ D0 explosion enable gates a noise generator
#include "sound/discrete.h"
#include "sound/pokey.h"
+#include "speaker.h"
+
+
/* This sets an amount of gain boost to apply to the final signal
* that will drive it into clipping. The slider is ajusted by the
* reverse factor, so that the final result is not clipped.