diff --git a/CCEngine/src/SystemParamsModel.cpp b/CCEngine/src/SystemParamsModel.cpp
index 5ba169f..89ee9cd 100644
--- a/CCEngine/src/SystemParamsModel.cpp
+++ b/CCEngine/src/SystemParamsModel.cpp
@@ -2,8 +2,10 @@
 
 #include <QtGui/QFont>
 
+#include <cstring>
 #include <sstream>
 #include <iomanip>
+
 namespace {
 
 	template< typename T >
@@ -31,14 +33,14 @@ namespace {
 		return (sum2 << std::numeric_limits<uint32_t>::digits) | sum1;
 	}
 
-	typedef std::string ParamHash;
-	ParamHash fletcher64(const std::string& input)
-	{
-		std::vector<uint32_t> buf((input.size() + sizeof(uint32_t) - 1) / sizeof(uint32_t), 0);
-		std::copy_n(std::begin(input), input.size(), stdext::make_checked_array_iterator((std::string::pointer)buf.data(), buf.size() * sizeof(uint32_t)));
-		auto resInt = fletcher64(buf.data(), buf.size());
-		return intToHex(resInt);
-	}
+    typedef std::string ParamHash;
+    ParamHash fletcher64(const std::string& input)
+    {
+        std::vector<uint32_t> buf((input.size() + sizeof(uint32_t) - 1) / sizeof(uint32_t), 0);
+        std::memcpy((std::string::pointer)buf.data(), input.data(), input.size());
+        auto resInt = ::fletcher64(buf.data(), static_cast<int>(buf.size()));
+        return intToHex(resInt);
+    }
 
 }