diff --git a/llvm/lib/IR/Module.cpp b/llvm/lib/IR/Module.cpp
index 5dd114c269ccb..33d71fb5ad817 100644
--- a/llvm/lib/IR/Module.cpp
+++ b/llvm/lib/IR/Module.cpp
@@ -49,6 +49,7 @@
 #include <cassert>
 #include <cstdint>
 #include <memory>
+#include <optional>
 #include <utility>
 #include <vector>
 
@@ -775,7 +776,7 @@ static VersionTuple getSDKVersionMD(Metadata *MD) {
   auto *Arr = dyn_cast_or_null<ConstantDataArray>(CM->getValue());
   if (!Arr)
     return {};
-  auto getVersionComponent = [&](unsigned Index) -> Optional<unsigned> {
+  auto getVersionComponent = [&](unsigned Index) -> std::optional<unsigned> {
     if (Index >= Arr->getNumElements())
       return None;
     return (unsigned)Arr->getElementAsInteger(Index);