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-rw-r--r--src/emu/emumem.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/emu/emumem.h b/src/emu/emumem.h
index 4a0a5830fa5..95a7c0d685e 100644
--- a/src/emu/emumem.h
+++ b/src/emu/emumem.h
@@ -17,6 +17,7 @@
#ifndef MAME_EMU_EMUMEM_H
#define MAME_EMU_EMUMEM_H
+#include <optional>
#include <type_traits>
using s8 = std::int8_t;