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-rw-r--r--src/mame/drivers/osborne1.cpp3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/mame/drivers/osborne1.cpp b/src/mame/drivers/osborne1.cpp
index 672c4e721b1..c4a5f45009e 100644
--- a/src/mame/drivers/osborne1.cpp
+++ b/src/mame/drivers/osborne1.cpp
@@ -338,7 +338,8 @@ MACHINE_CONFIG_START(osborne1_state::osborne1)
MCFG_SOFTWARE_LIST_ADD("flop_list","osborne1")
MACHINE_CONFIG_END
-MACHINE_CONFIG_DERIVED(osborne1nv_state::osborne1nv, osborne1)
+MACHINE_CONFIG_START(osborne1nv_state::osborne1nv)
+ osborne1(config);
MCFG_CPU_MODIFY("maincpu")
MCFG_CPU_IO_MAP(osborne1nv_io)