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-rw-r--r--src/mame/drivers/4004clk.cpp2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/mame/drivers/4004clk.cpp b/src/mame/drivers/4004clk.cpp
index d383d35df13..db89509ff84 100644
--- a/src/mame/drivers/4004clk.cpp
+++ b/src/mame/drivers/4004clk.cpp
@@ -12,6 +12,8 @@
#include "cpu/i4004/i4004.h"
#include "sound/dac.h"
#include "sound/volt_reg.h"
+#include "speaker.h"
+
#include "4004clk.lh"
class nixieclock_state : public driver_device