diff --git a/trpc/config/BUILD b/trpc/config/BUILD
index 447d590a..a60cae4d 100644
--- a/trpc/config/BUILD
+++ b/trpc/config/BUILD
@@ -132,6 +132,7 @@ cc_test(
     srcs = ["trpc_conf_compatible_test.cc"],
     deps = [
         ":trpc_conf",
+        "@com_github_fmtlib_fmt//:fmtlib",
         "@com_google_googletest//:gtest",
         "@com_google_googletest//:gtest_main",
     ],
diff --git a/trpc/config/trpc_conf_compatible.cc b/trpc/config/trpc_conf_compatible.cc
index f4eb4f60..9031da29 100644
--- a/trpc/config/trpc_conf_compatible.cc
+++ b/trpc/config/trpc_conf_compatible.cc
@@ -282,7 +282,7 @@ bool TransformConfig(const Json::Value& from, std::map<std::string, std::string>
       Json::ValueType value_type = from[*it].type();
       switch (value_type) {
         case Json::intValue: {
-          config_map->insert(std::pair<std::string, std::string>(key_name, std::to_string(from[*it].asInt())));
+          config_map->insert(std::pair<std::string, std::string>(key_name, std::to_string(from[*it].asInt64())));
           break;
         }
         case Json::uintValue: {
diff --git a/trpc/config/trpc_conf_compatible_test.cc b/trpc/config/trpc_conf_compatible_test.cc
index 9026d47b..d7c9e81c 100644
--- a/trpc/config/trpc_conf_compatible_test.cc
+++ b/trpc/config/trpc_conf_compatible_test.cc
@@ -1,5 +1,7 @@
 #include "trpc/config/trpc_conf_compatible.h"
 
+#include "fmt/core.h"
+#include "fmt/format.h"
 #include "gtest/gtest.h"
 #include "json/json.h"
 #include "yaml-cpp/yaml.h"
@@ -65,6 +67,7 @@ TEST_F(TrpcConfCompatibleTest, GetInt64_Success) {
   ASSERT_EQ(result, -42);
 }
 
+
 TEST_F(TrpcConfCompatibleTest, GetInt64_Fail) {
   Json::Value config_json;
   config_json["value1"] = 42;
@@ -152,4 +155,39 @@ TEST_F(TrpcConfCompatibleTest, ExtractYamlKeys) {
   ASSERT_EQ(yaml_keys[1], "key2");
 }
 
+TEST_F(TrpcConfCompatibleTest, TransformConfig_JSON_Success_WithIntegerMaxAndMin) {
+  auto int_max = std::numeric_limits<std::int32_t>::max();
+  auto int_min = std::numeric_limits<std::int32_t>::min();
+  auto int64_max = std::numeric_limits<std::int64_t>::max();
+  auto int64_min = std::numeric_limits<std::int64_t>::min();
+  std::string from = fmt::format(R"({{"id": "0001", "int_max": {}, "int_min": {}, "int64_max": {}, "int64_min": {}}})",
+                                 int_max, int_min, int64_max, int64_min);
+
+  Json::Value json_value;
+  bool trans_result = trpc::config::TransformConfig(from, &json_value);
+  ASSERT_TRUE(trans_result);
+
+  std::map<std::string, std::string> out_map;
+  trans_result = trpc::config::TransformConfig(json_value, &out_map, "");
+  ASSERT_TRUE(trans_result);
+  ASSERT_TRUE(out_map.find("id") != out_map.end());
+  ASSERT_TRUE(out_map.find("int_max") != out_map.end());
+  ASSERT_TRUE(out_map.find("int_min") != out_map.end());
+  ASSERT_TRUE(out_map.find("int64_max") != out_map.end());
+  ASSERT_TRUE(out_map.find("int64_min") != out_map.end());
+}
+
+TEST_F(TrpcConfCompatibleTest, TransformConfig_JSON_Fail_WithIntegerOverflow) {
+  std::string int_overflow{"12233344449223372036854775807"};
+  std::string from = fmt::format(R"({{"id": "0001", "int_overflow": {}}})", int_overflow);
+
+  Json::Value json_value;
+  bool trans_result = trpc::config::TransformConfig(from, &json_value);
+  // Overflowed integer-64 value in cpp-json is ok.
+  ASSERT_TRUE(trans_result);
+
+  int64_t v{0};
+  ASSERT_FALSE(trpc::config::GetInt64(json_value, "int_overflow", &v));
+}
+
 }  // namespace trpc::testing