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-rw-r--r--src/mame/includes/williams.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/mame/includes/williams.h b/src/mame/includes/williams.h
index 567013ca6bc..7661ddb6264 100644
--- a/src/mame/includes/williams.h
+++ b/src/mame/includes/williams.h
@@ -11,6 +11,7 @@
#include "cpu/m6800/m6800.h"
#include "sound/hc55516.h"
#include "machine/ticket.h"
+#include "machine/timer.h"
#include "machine/watchdog.h"
#include "machine/6821pia.h"
#include "machine/bankdev.h"