diff --git a/include/libimp/error.h b/include/libimp/error.h
index 7762aa0..1cc59bd 100644
--- a/include/libimp/error.h
+++ b/include/libimp/error.h
@@ -28,6 +28,7 @@ public:
   virtual ~error_category() noexcept = default;
 
   /// @brief observer
+  virtual std::string name() const = 0;
   virtual std::string message(result_code r) const = 0;
 
   /// @brief comparison function
@@ -65,4 +66,14 @@ public:
   friend LIBIMP_EXPORT bool operator!=(error_code const &lhs, error_code const &rhs) noexcept;
 };
 
+/**
+ * @brief @brief Custom defined fmt_to method for imp::fmt
+ */
+namespace detail {
+
+inline bool tag_invoke(decltype(::LIBIMP::fmt_to), fmt_context &ctx, error_code r) noexcept {
+  return fmt_to(ctx, r.message());
+}
+
+} // namespace detail
 LIBIMP_NAMESPACE_END_
diff --git a/src/libimp/error.cpp b/src/libimp/error.cpp
index 0b10a7f..7c4cafd 100644
--- a/src/libimp/error.cpp
+++ b/src/libimp/error.cpp
@@ -13,8 +13,11 @@ namespace {
 
 class generic_error_category : public error_category {
 public:
+  std::string name() const {
+    return "generic";
+  }
   std::string message(result_code r) const {
-    return fmt("[", r.value(), (!r ? ", \"success\"]" : ", \"failure\"]"));
+    return fmt(r.value(), (!r ? ", \"success\"" : ", \"failure\""));
   }
 };
 
@@ -44,7 +47,7 @@ error_category const &error_code::category() const noexcept {
 }
 
 std::string error_code::message() const {
-  return ec_->message(r_code_);
+  return fmt("[", ec_->name(), ": ", ec_->message(r_code_), "]");
 }
 
 error_code::operator bool() const noexcept {
diff --git a/test/imp/test_imp_error.cpp b/test/imp/test_imp_error.cpp
index 08e0d1a..d985a3b 100644
--- a/test/imp/test_imp_error.cpp
+++ b/test/imp/test_imp_error.cpp
@@ -10,6 +10,9 @@ namespace {
 
 class custom_error_category : public imp::error_category {
 public:
+  std::string name() const {
+    return "custom";
+  }
   std::string message(imp::result_code r) const {
     return !r ? "success" : "failure";
   }
@@ -21,11 +24,11 @@ TEST(error, error_code) {
   imp::error_code ecode;
   EXPECT_FALSE(ecode);
   std::cout << ecode.message() << "\n";
-  EXPECT_EQ(ecode.message(), "[0, \"success\"]");
+  EXPECT_EQ(ecode.message(), "[generic: 0, \"success\"]");
 
   custom_error_category cec;
   ecode = {123, cec};
   EXPECT_TRUE(ecode);
   std::cout << ecode.message() << "\n";
-  EXPECT_EQ(ecode.message(), cec.message(123));
+  EXPECT_EQ(ecode.message(), imp::fmt("[", cec.name(), ": ", cec.message(123), "]"));
 }
\ No newline at end of file