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-rw-r--r--src/devices/sound/spkrdev.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/devices/sound/spkrdev.h b/src/devices/sound/spkrdev.h
index ac9535108ed..b7d0ac95cec 100644
--- a/src/devices/sound/spkrdev.h
+++ b/src/devices/sound/spkrdev.h
@@ -20,7 +20,7 @@ class speaker_sound_device : public device_t,
public device_sound_interface
{
public:
- speaker_sound_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
+ speaker_sound_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock = 0);
~speaker_sound_device() {}
// configuration