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-rw-r--r--src/mame/drivers/vt220.cpp3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/mame/drivers/vt220.cpp b/src/mame/drivers/vt220.cpp
index dc5f179e0d2..9423ffcb7e4 100644
--- a/src/mame/drivers/vt220.cpp
+++ b/src/mame/drivers/vt220.cpp
@@ -125,7 +125,8 @@ MACHINE_CONFIG_START(vt220_state::vt220)
MCFG_RAM_DEFAULT_SIZE("16K")
MACHINE_CONFIG_END
-MACHINE_CONFIG_DERIVED(vt220_state::vt220a, vt220)
+MACHINE_CONFIG_START(vt220_state::vt220a)
+ vt220(config);
MCFG_CPU_MODIFY("maincpu")
MCFG_CPU_PROGRAM_MAP(vt220a_mem)
MCFG_CPU_IO_MAP(vt220a_io)