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-rw-r--r--al/event.cpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/al/event.cpp b/al/event.cpp
index 089cc1ac..570cbbc1 100644
--- a/al/event.cpp
+++ b/al/event.cpp
@@ -10,6 +10,7 @@
#include <memory>
#include <mutex>
#include <new>
+#include <optional>
#include <string>
#include <string_view>
#include <thread>