--- a/mcproxy/src/parser/parser.cpp
+++ b/mcproxy/src/parser/parser.cpp
@@ -125,7 +125,10 @@ void parser::parse_instance_definition(i
                 get_next_token();
                 if (m_current_token.get_type() == TT_STRING) {
                     try {
-                        table_number = std::stoi(m_current_token.get_string());
+                        std::stringstream convert;
+
+                        convert << m_current_token.get_string();
+                        convert >> table_number;
                         user_selected_table_number = true;
                     } catch (std::logic_error e) {
                         HC_LOG_ERROR("failed to parse line " << m_current_line << " table number: " << table_number << " is not a number");
@@ -298,7 +301,11 @@ std::unique_ptr<addr_match> parser::pars
             get_next_token();
             if (m_current_token.get_type() == TT_STRING) {
                 try {
-                    unsigned int prefix = std::stoi(m_current_token.get_string());
+                    std::stringstream convert;
+                    unsigned int prefix;
+
+                    convert << m_current_token.get_string();
+                    convert >> prefix;
                     if (prefix > 128) {
                         throw;
                     }
@@ -560,7 +567,11 @@ void parser::parse_interface_rule_match_
             get_next_token();
             if (m_current_token.get_type() == TT_STRING) {
                 try {
-                    int tmp_timeout = std::stoi(m_current_token.get_string());
+                    std::stringstream convert;
+                    int tmp_timeout;
+
+                    convert << m_current_token.get_string();
+                    convert >> tmp_timeout;
                     timeout = std::chrono::milliseconds(tmp_timeout);
                 } catch (...) {
                     error_notification();
--- a/mcproxy/src/utils/addr_storage.cpp
+++ b/mcproxy/src/utils/addr_storage.cpp
@@ -298,7 +298,13 @@ addr_storage& addr_storage::set_port(uin
 
 addr_storage& addr_storage::set_port(const std::string& port)
 {
-    set_port(std::stoi(port.c_str()));
+    std::stringstream convert;
+    int num_port;
+
+    convert << port;
+    convert >> num_port;
+
+    set_port(num_port);
     return *this;
 }