diff --git a/include/common/enum_errcode.hpp b/include/common/enum_errcode.hpp
index bda7d9e2..c075ed74 100644
--- a/include/common/enum_errcode.hpp
+++ b/include/common/enum_errcode.hpp
@@ -131,4 +131,8 @@ static inline constexpr const auto ErrCodeStr = []() constexpr {
 }
 ();
 
+inline uint32_t format_as(ErrCode code) {
+  return code.getCode();
+}
+
 } // namespace WasmEdge
diff --git a/thirdparty/wasi/api.hpp b/thirdparty/wasi/api.hpp
index 97d37c83..53fadf1d 100644
--- a/thirdparty/wasi/api.hpp
+++ b/thirdparty/wasi/api.hpp
@@ -21,6 +21,7 @@
 #include <cstddef>
 #include <cstdint>
 #include <type_traits>
+#include <fmt/format.h>
 
 using const_uint8_t_ptr = uint32_t;
 using uint8_t_ptr = uint32_t;
@@ -562,6 +563,10 @@ enum __wasi_errno_t : uint16_t {
 static_assert(sizeof(__wasi_errno_t) == 2, "witx calculated size");
 static_assert(alignof(__wasi_errno_t) == 2, "witx calculated align");
 
+inline uint16_t format_as(__wasi_errno_t error) {
+  return fmt::underlying(error);
+}
+
 /**
  * File descriptor rights, determining which actions may be performed.
  */