diff --git a/external/3rd/library/soePlatform/VChatAPI/utils2.0/utils/Base/MD5.cpp b/external/3rd/library/soePlatform/VChatAPI/utils2.0/utils/Base/MD5.cpp
index 168bc674..b61c7100 100644
--- a/external/3rd/library/soePlatform/VChatAPI/utils2.0/utils/Base/MD5.cpp
+++ b/external/3rd/library/soePlatform/VChatAPI/utils2.0/utils/Base/MD5.cpp
@@ -253,7 +253,7 @@ namespace soe
         Update( achar, achar.size() );
     }
 
-    void MD5::Update(vector<char> achar0)
+    void MD5::Update(const vector<char> &achar0)
     {
         Update(achar0, 0, achar0.size());
     }
diff --git a/external/3rd/library/soePlatform/VChatAPI/utils2.0/utils/Base/MD5.h b/external/3rd/library/soePlatform/VChatAPI/utils2.0/utils/Base/MD5.h
index 11370702..bf38a4f1 100644
--- a/external/3rd/library/soePlatform/VChatAPI/utils2.0/utils/Base/MD5.h
+++ b/external/3rd/library/soePlatform/VChatAPI/utils2.0/utils/Base/MD5.h
@@ -33,7 +33,7 @@ namespace soe
             void Update(char char0);
             void Update(State & state1, const std::vector<char> &achar0, int i, int j);
             void Update(const std::string &s);
-            void Update(std::vector<char> achar0);
+            void Update(const std::vector<char> &achar0);
             void Update(const std::vector<char> &achar0, int i);
             void Update(const std::vector<char> &achar0, int i, int j);
             std::string asHex();