1 files changed, 2 insertions, 1 deletions
diff --git a/clang/lib/Serialization/ModuleManager.cpp b/clang/lib/Serialization/ModuleManager.cpp
index ae4ea61..b9fa23b 100644
--- a/clang/lib/Serialization/ModuleManager.cpp
+++ b/clang/lib/Serialization/ModuleManager.cpp
@@ -35,6 +35,7 @@
 #include <algorithm>
 #include <cassert>
 #include <memory>
+#include <optional>
 #include <string>
 #include <system_error>
 
@@ -444,7 +445,7 @@ void ModuleManager::visit(llvm::function_ref<bool(ModuleFile &M)> Visitor,
 
 bool ModuleManager::lookupModuleFile(StringRef FileName, off_t ExpectedSize,
                                      time_t ExpectedModTime,
-                                     Optional<FileEntryRef> &File) {
+                                     std::optional<FileEntryRef> &File) {
   File = std::nullopt;
   if (FileName == "-")
     return false;