#include <curl/curl.h>
 #include "kds_s2000w_client.h"
 
-size_t kds_s2000w_client_callback(char *ptr, size_t size, size_t nmemb, void *userdata)
+size_t _kds_s2000w_client_callback(char *ptr, size_t size, size_t nmemb, void *userdata)
 {
        response* data = (response*) userdata;
        size_t fullsize = size * nmemb;
        curl_easy_setopt(curl, CURLOPT_URL, url);
        curl_easy_setopt(curl, CURLOPT_POST, 1L);
        curl_easy_setopt(curl, CURLOPT_POSTFIELDS, body);
-       curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, kds_s2000w_client_callback);
+       curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, _kds_s2000w_client_callback);
        curl_easy_setopt(curl, CURLOPT_WRITEDATA, (void*) response);
        CURLcode result = curl_easy_perform(curl);
        curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &response->code);
 
        curl_easy_setopt(curl, CURLOPT_URL, url);
        curl_easy_setopt(curl, CURLOPT_HTTPGET, 1L);
-       curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, kds_s2000w_client_callback);
+       curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, _kds_s2000w_client_callback);
        curl_easy_setopt(curl, CURLOPT_WRITEDATA, (void*) response);
        CURLcode result = curl_easy_perform(curl);
        curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &response->code);
 
        curl_easy_setopt(curl, CURLOPT_URL, url);
        curl_easy_setopt(curl, CURLOPT_HTTPGET, 1L);
-       curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, kds_s2000w_client_callback);
+       curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, _kds_s2000w_client_callback);
        curl_easy_setopt(curl, CURLOPT_WRITEDATA, (void*) response);
        CURLcode result = curl_easy_perform(curl);
        curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &response->code);