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-rw-r--r--src/mame/drivers/madalien.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/mame/drivers/madalien.cpp b/src/mame/drivers/madalien.cpp
index 84b65042ac0..1e7cc2b57e6 100644
--- a/src/mame/drivers/madalien.cpp
+++ b/src/mame/drivers/madalien.cpp
@@ -18,7 +18,7 @@
#include "speaker.h"
-#define SOUND_CLOCK XTAL_4MHz
+#define SOUND_CLOCK XTAL(4'000'000)
INPUT_CHANGED_MEMBER(madalien_state::coin_inserted)