diff --git a/judger/uoj_judger/include/uoj_judger.h b/judger/uoj_judger/include/uoj_judger.h
index d449242..0dda40c 100644
--- a/judger/uoj_judger/include/uoj_judger.h
+++ b/judger/uoj_judger/include/uoj_judger.h
@@ -620,7 +620,7 @@ int conf_int(const string &key, const int &val) {
 	if (config.count(key) == 0) {
 		return val;
 	}
-	return atoi(config[key].c_str());
+	return stoi(config[key]);
 }
 int conf_int(const string &key, int num, const int &val) {
 	ostringstream sout;
@@ -628,7 +628,7 @@ int conf_int(const string &key, int num, const int &val) {
 	if (config.count(sout.str()) == 0) {
 		return conf_int(key, val);
 	}
-	return atoi(config[sout.str()].c_str());
+	return stoi(config[sout.str()]);
 }
 int conf_int(const string &key)  {
 	return conf_int(key, 0);
diff --git a/judger/uoj_judger/include/uoj_judger_v2.h b/judger/uoj_judger/include/uoj_judger_v2.h
index e8f1598..c6277f5 100644
--- a/judger/uoj_judger/include/uoj_judger_v2.h
+++ b/judger/uoj_judger/include/uoj_judger_v2.h
@@ -488,7 +488,7 @@ int conf_int(const string &key, const int &val) {
 	if (uconfig.count(key) == 0) {
 		return val;
 	}
-	return atoi(uconfig[key].c_str());
+	return stoi(uconfig[key]);
 }
 int conf_int(const string &key, int num, const int &val) {
 	ostringstream sout;
@@ -496,7 +496,7 @@ int conf_int(const string &key, int num, const int &val) {
 	if (uconfig.count(sout.str()) == 0) {
 		return conf_int(key, val);
 	}
-	return atoi(uconfig[sout.str()].c_str());
+	return stoi(uconfig[sout.str()]);
 }
 int conf_int(const string &key)  {
 	return conf_int(key, 0);