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-rw-r--r--libadhocutil/cache.impl.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/libadhocutil/cache.impl.h b/libadhocutil/cache.impl.h
index 6b72e29..2f509f8 100644
--- a/libadhocutil/cache.impl.h
+++ b/libadhocutil/cache.impl.h
@@ -6,6 +6,7 @@
#include <boost/lambda/lambda.hpp>
#include <ctime>
#include <memory>
+#include <mutex> // IWYU pragma: keep
#include <variant>
// IWYU pragma: no_include <boost/multi_index/detail/unbounded.hpp>