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-rw-r--r--src/mame/drivers/swtpc.cpp3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/mame/drivers/swtpc.cpp b/src/mame/drivers/swtpc.cpp
index 7eaf6de0cd6..b007b51b3ae 100644
--- a/src/mame/drivers/swtpc.cpp
+++ b/src/mame/drivers/swtpc.cpp
@@ -176,7 +176,8 @@ MACHINE_CONFIG_START(swtpc_state::swtpc)
MCFG_RAM_EXTRA_OPTIONS("4K,8K,12K,16K,20K,24K,28K,32K")
MACHINE_CONFIG_END
-MACHINE_CONFIG_DERIVED(swtpc_state::swtpcm, swtpc)
+MACHINE_CONFIG_START(swtpc_state::swtpcm)
+ swtpc(config);
MCFG_CPU_MODIFY("maincpu")
MCFG_CPU_CLOCK(XTAL(1'797'100) / 2)