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-rw-r--r--src/mame/drivers/s4.cpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/mame/drivers/s4.cpp b/src/mame/drivers/s4.cpp
index 9aa71014619..95d34752989 100644
--- a/src/mame/drivers/s4.cpp
+++ b/src/mame/drivers/s4.cpp
@@ -36,6 +36,7 @@ ToDo:
#include "cpu/m6800/m6800.h"
#include "machine/6821pia.h"
+#include "machine/timer.h"
#include "sound/dac.h"
#include "sound/volt_reg.h"
#include "speaker.h"