diff --git a/llvm/examples/Kaleidoscope/Chapter8/toy.cpp b/llvm/examples/Kaleidoscope/Chapter8/toy.cpp
--- a/llvm/examples/Kaleidoscope/Chapter8/toy.cpp
+++ b/llvm/examples/Kaleidoscope/Chapter8/toy.cpp
@@ -30,6 +30,7 @@
 #include <system_error>
 #include <utility>
 #include <vector>
+#include <optional>
 
 using namespace llvm;
 using namespace llvm::sys;
@@ -1243,7 +1244,7 @@
   auto Features = "";
 
   TargetOptions opt;
-  auto RM = Optional<Reloc::Model>();
+  std::optional<Reloc::Model> RM;
   auto TheTargetMachine =
       Target->createTargetMachine(TargetTriple, CPU, Features, opt, RM);