diff --git a/sane/gb_json.cpp b/sane/gb_json.cpp
index 428b8b0..add68b7 100644
--- a/sane/gb_json.cpp
+++ b/sane/gb_json.cpp
@@ -1159,7 +1159,7 @@ namespace gb
 
         for (size_t i = 0; i < bytes; ++i)
         {
-            sprintf_s(buf, _countof(buf) - 1, "%02X", ptr[i]);
+            sprintf(buf, "%02X", ptr[i]);
             hex += buf;
         }
 
@@ -1205,7 +1205,7 @@ namespace gb
     bool sane_config_schm::load_from_mem(const char* mem, bool in_b64)
     {
         gb::base64	b64;
-        std::string stream(in_b64 ? b64.decode(mem, lstrlenA(mem)) : mem);
+        std::string stream(in_b64 ? b64.decode(mem, strlen(mem)) : mem);
 
         clear();
         jsn_ = new gb::json();
@@ -1367,7 +1367,7 @@ namespace gb
             if(with_ver)
             {
                 char    ver[40] = { 0 };
-                sprintf_s(ver, "%u.%u", VERSION_MAIN, VERSION_SUB);
+                sprintf(ver, "%u.%u", VERSION_MAIN, VERSION_SUB);
                 jsn_->set_value("ver", ver);
             }
 
@@ -1448,7 +1448,7 @@ namespace gb
                 } while (jsn_->next_child(val, &name));
             }
         }
-        sprintf_s(vs, _countof(vs) - 1, "%u.%u", VERSION_MAIN, VERSION_SUB);
+        sprintf(vs, "%u.%u", VERSION_MAIN, VERSION_SUB);
         jsn_->set_value("ver", vs);
 
         if (changed)
@@ -1699,7 +1699,7 @@ namespace gb
         if (it == schemes_.end())
             global_->set_value(scanner_cfg::cur_sel_.c_str(), -1);
         else
-            global_->set_value(scanner_cfg::cur_sel_.c_str(), it - schemes_.begin());
+            global_->set_value(scanner_cfg::cur_sel_.c_str(), (int)(it - schemes_.begin()));
 
         return true;
     }