diff --git a/bootstrap b/bootstrap
index 03d9ef0df94f7bedae5940b9fada8760d519633b..69646837f921ee319edb42de4f3df61c1134c9b6 100755
--- a/bootstrap
+++ b/bootstrap
@@ -1168,7 +1168,7 @@ int check_cxx14()
 }
 #endif
 
-#if (__cplusplus >= 201703L || defined(__INTEL_COMPILER) && defined(__cpp_if_constexpr))
+#if (__cplusplus >= 201703L || defined(__INTEL_COMPILER) && defined(__cpp_deduction_guides))
 #include <optional>
 template <typename T,
           typename std::invoke_result<decltype(&T::get), T>::type = nullptr>