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-rw-r--r--clang/include/clang/Basic/FileSystemStatCache.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/clang/include/clang/Basic/FileSystemStatCache.h b/clang/include/clang/Basic/FileSystemStatCache.h
index d37f2d507f83..e9f9fa31a0b3 100644
--- a/clang/include/clang/Basic/FileSystemStatCache.h
+++ b/clang/include/clang/Basic/FileSystemStatCache.h
@@ -23,6 +23,7 @@
#include <cstdint>
#include <ctime>
#include <memory>
+#include <optional>
#include <string>
#include <utility>