diff --git a/winlibs/include/opencc/DictEntry.hpp b/winlibs/include/opencc/DictEntry.hpp
index ecef4891..0a840a68 100644
--- a/winlibs/include/opencc/DictEntry.hpp
+++ b/winlibs/include/opencc/DictEntry.hpp
@@ -140,11 +140,11 @@ public:
   size_t NumValues() const { return values.size(); }
 
   vector<const char*> Values() const {
-    vector<const char*> values;
+    vector<const char*> retsult;
     for (const string& value : this->values) {
-      values.push_back(value.c_str());
+      retsult.push_back(value.c_str());
     }
-    return values;
+    return retsult;
   }
 
 private:
diff --git a/winlibs/include/opencc/Exception.hpp b/winlibs/include/opencc/Exception.hpp
index a1134e85..33cb5d9d 100644
--- a/winlibs/include/opencc/Exception.hpp
+++ b/winlibs/include/opencc/Exception.hpp
@@ -32,7 +32,7 @@
 
 namespace opencc {
 
-class OPENCC_EXPORT Exception : public std::exception {
+class OPENCC_EXPORT Exception {
 public:
   Exception() {}
 
diff --git a/winlibs/include/opencc/UTF8Util.hpp b/winlibs/include/opencc/UTF8Util.hpp
index ea03dc01..70bbf83b 100644
--- a/winlibs/include/opencc/UTF8Util.hpp
+++ b/winlibs/include/opencc/UTF8Util.hpp
@@ -262,20 +262,22 @@ public:
 #ifdef _MSC_VER
   static std::string U16ToU8(const std::wstring& wstr) {
     std::string ret;
-    int convcnt = WideCharToMultiByte(CP_UTF8, 0, wstr.c_str(), wstr.length(), NULL, 0, NULL, NULL);
+    int length = static_cast<int>(wstr.length());
+    int convcnt = WideCharToMultiByte(CP_UTF8, 0, wstr.c_str(), length, NULL, 0, NULL, NULL);
     if (convcnt > 0) {
       ret.resize(convcnt);
-      WideCharToMultiByte(CP_UTF8, 0, wstr.c_str(), wstr.length(), &ret[0], convcnt, NULL, NULL);
+      WideCharToMultiByte(CP_UTF8, 0, wstr.c_str(), length, &ret[0], convcnt, NULL, NULL);
     }
     return ret;
   }
 
   static std::wstring U8ToU16(const std::string& str) {
     std::wstring ret;
-    int convcnt = MultiByteToWideChar(CP_UTF8, 0, str.c_str(), str.length(), NULL, 0);
+    int length = static_cast<int>(str.length());
+    int convcnt = MultiByteToWideChar(CP_UTF8, 0, str.c_str(), length, NULL, 0);
     if (convcnt > 0) {
       ret.resize(convcnt);
-      MultiByteToWideChar(CP_UTF8, 0, str.c_str(), str.length(), &ret[0], convcnt);
+      MultiByteToWideChar(CP_UTF8, 0, str.c_str(), length, &ret[0], convcnt);
     }
     return ret;
   }
diff --git a/winlibs/lib/libopencc.dll.a b/winlibs/lib/libopencc.dll.a
index 9da2061a..04dc187f 100644
Binary files a/winlibs/lib/libopencc.dll.a and b/winlibs/lib/libopencc.dll.a differ
diff --git a/winlibs/lib/opencc.dll b/winlibs/lib/opencc.dll
index 1835d054..834a698f 100644
Binary files a/winlibs/lib/opencc.dll and b/winlibs/lib/opencc.dll differ