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-rw-r--r--src/devices/bus/thomson/extension.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/devices/bus/thomson/extension.h b/src/devices/bus/thomson/extension.h
index bbe9db92915..6682acef364 100644
--- a/src/devices/bus/thomson/extension.h
+++ b/src/devices/bus/thomson/extension.h
@@ -24,7 +24,7 @@ public:
class thomson_extension_device : public device_t, public device_single_card_slot_interface<thomson_extension_interface>
{
public:
- thomson_extension_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock = 0);
+ thomson_extension_device(const machine_config &mconfig, const char *tag, device_t *owner, const XTAL &clock = XTAL());
virtual ~thomson_extension_device() = default;
void rom_map(address_space_installer &space, offs_t start, offs_t end);