diff --git a/src/api/API.cpp b/src/api/API.cpp
index ffa1a77..de05fcb 100644
--- a/src/api/API.cpp
+++ b/src/api/API.cpp
@@ -21,14 +21,12 @@ std::string API::request(std::string myurl) {
 std::string
 API::request(std::string myurl, bool post, Hashmap<std::string, std::string> &map, std::vector<std::string> &headers) {
     CURL *curl;
-    CURLcode res;
-
 
     curl = curl_easy_init();
 
     struct curl_slist *list = nullptr;
     for (int j = 0; j < headers.size(); ++j) {
-        list = curl_slist_append(list, headers.at(j).c_str());
+        list = curl_slist_append(list, headers.at((unsigned long)(j)).c_str());
     }
 
     std::string readString;
@@ -73,7 +71,7 @@ API::request(std::string myurl, bool post, Hashmap<std::string, std::string> &ma
         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_data);
         curl_easy_setopt(curl, CURLOPT_WRITEDATA, &readString);
 
-        res = curl_easy_perform(curl);
+        curl_easy_perform(curl);
 
         curl_easy_cleanup(curl);
     }
diff --git a/src/api/Hashmap.h b/src/api/Hashmap.h
index 4fc90d5..34abdac 100644
--- a/src/api/Hashmap.h
+++ b/src/api/Hashmap.h
@@ -43,7 +43,7 @@ valuetype Hashmap<keytype, valuetype>::getValue(int position) {
 
 template<class keytype, class valuetype>
 int Hashmap<keytype, valuetype>::size() {
-    return keys.size();
+    return (int)(keys.size());
 }
 
 
diff --git a/src/main.cpp b/src/main.cpp
index 8797dab..08d237c 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -1,5 +1,6 @@
 #include <iostream>
 #include <ctime>
+#include <unordered_map>
 
 #include "api/API.h"
 #include "Logger.h"
@@ -24,7 +25,7 @@ int main(int argc, char *argv[]) {
 
         std::string ip = api.request("https://api.ipify.org");
 
-        if (ip == "") {
+        if (ip.empty()) {
             //no internet connection
             logger.logToLogfile("[WARNING] no internet connection");
             std::cout << "[WARNING] no internet connection" << std::endl;