diff --git a/Encrypt/SecureHashAlgorithm.h b/Encrypt/SecureHashAlgorithm.h
index 2e41f9e..9a40cea 100644
--- a/Encrypt/SecureHashAlgorithm.h
+++ b/Encrypt/SecureHashAlgorithm.h
@@ -3,6 +3,7 @@
 
 #include <string>
 #include <string_view>
+#include <cstdint>
 
 class SecureHashAlgorithmPrivate;
 
diff --git a/Universal/StringUtility.cpp b/Universal/StringUtility.cpp
index 17b7acb..57f3dba 100644
--- a/Universal/StringUtility.cpp
+++ b/Universal/StringUtility.cpp
@@ -97,6 +97,7 @@ slow:
 }
 
 std::string UTF8ToGBK(const std::string &utf8Str) {
+#ifdef WIN32
     int wideStrLen = MultiByteToWideChar(CP_UTF8, 0, utf8Str.c_str(), -1, NULL, 0);
     if (wideStrLen == 0) {
         return "";
@@ -112,8 +113,11 @@ std::string UTF8ToGBK(const std::string &utf8Str) {
 
     std::string gbkStr(gbkStrLen, 0);
     WideCharToMultiByte(CP_ACP, 0, wideStr.c_str(), -1, &gbkStr[0], gbkStrLen, NULL, NULL);
-
     return gbkStr;
+#else
+    assert(false && "not implement.");
+    return "";
+#endif
 }
 
 } // namespace StringUtility