diff --git a/nebula_common/include/nebula_common/util/expected.hpp b/nebula_common/include/nebula_common/util/expected.hpp
index 6a441db70..d5e40c7ed 100644
--- a/nebula_common/include/nebula_common/util/expected.hpp
+++ b/nebula_common/include/nebula_common/util/expected.hpp
@@ -1,6 +1,7 @@
 #pragma once
 
 #include <variant>
+#include <string>
 
 namespace nebula
 {