diff --git a/Encrypt/Encrypt.h b/Encrypt/Encrypt.h
index 3c9b5f9..90b3946 100644
--- a/Encrypt/Encrypt.h
+++ b/Encrypt/Encrypt.h
@@ -7,7 +7,7 @@
 
 class Encrypt {
 public:
-    using Sha1DigestType = unsigned int[5];
+    using Sha1DigestType = unsigned char[20];
     static std::string encode64(const char *data, size_t size);
     static std::string encode64(const std::string_view &data);
     static std::string decode64(const std::string_view &data);