diff --git a/Argo/StdModule.cc b/Argo/StdModule.cc
index 158a910..98cb72b 100644
--- a/Argo/StdModule.cc
+++ b/Argo/StdModule.cc
@@ -7,6 +7,7 @@ module;
 #include <array>
 #include <charconv>
 #include <concepts>
+#include <expected>
 #include <format>
 #include <functional>
 #include <iostream>
@@ -127,6 +128,9 @@ using ::std::reference_wrapper;
 using ::std::nullopt;
 using ::std::optional;
 
+// expected
+using ::std::expected;
+
 // NOLINTEND(bugprone-reserved-identifier)
 
 }  // namespace std