diff --git a/src/mame/drivers/segas18.cpp b/src/mame/drivers/segas18.cpp index 12622617bef..406662caf64 100644 --- a/src/mame/drivers/segas18.cpp +++ b/src/mame/drivers/segas18.cpp @@ -222,7 +222,7 @@ uint16_t segas18_state::misc_io_r(address_space &space, offs_t offset, uint16_t } if (!m_custom_io_r.isnull()) - return m_custom_io_r(mem_mask); + return m_custom_io_r(offset); logerror("%06X:misc_io_r - unknown read access to address %04X\n", m_maincpu->pc(), offset * 2); return m_mapper->open_bus_r(); }