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-rw-r--r--src/buildtool/multithreading/async_map.hpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/buildtool/multithreading/async_map.hpp b/src/buildtool/multithreading/async_map.hpp
index 3267b312..41e7dded 100644
--- a/src/buildtool/multithreading/async_map.hpp
+++ b/src/buildtool/multithreading/async_map.hpp
@@ -15,6 +15,7 @@
#ifndef INCLUDED_SRC_BUILDTOOL_MULTITHREADING_ASYNC_MAP_HPP
#define INCLUDED_SRC_BUILDTOOL_MULTITHREADING_ASYNC_MAP_HPP
+#include <cstddef>
#include <memory>
#include <mutex> // unique_lock
#include <shared_mutex>