diff --git a/include/stdex/string.hpp b/include/stdex/string.hpp
index 79134f8e4..a2d129d2d 100644
--- a/include/stdex/string.hpp
+++ b/include/stdex/string.hpp
@@ -1935,7 +1935,8 @@ namespace stdex
 	/// This allows returned string to be fed into std::unique_ptr<T> for auto release.
 	///
 	/// \param[in] str    String to duplicate.
-	/// \param[in] count  Number of code units in str.
+	/// \param[in] count  Number of code units in str. Duplicated string will have this number of code units allocated.
+	///                   If str contains zero terminator, duplicated string will also be zero terminated.
 	///
 	/// \return Pointer to duplicated string. Use delete[] operator to free the memory.
 	///
@@ -1945,7 +1946,7 @@ namespace stdex
 		_In_ size_t count)
 	{
 		T* dst = new T[count];
-		strncpy(dst, count, str, SIZE_MAX);
+		strncpy(dst, count, str, count);
 		return dst;
 	}
 
@@ -1955,7 +1956,8 @@ namespace stdex
 	/// In contrast with the stdlib C strdup, the memory is allocated using operator new T[].
 	/// This allows returned string to be fed into std::unique_ptr<T> for auto release.
 	///
-	/// \param[in] str  String to duplicate. Must be zero-terminated.
+	/// \param[in] str  String to duplicate.
+	///                 If str contains zero terminator, duplicated string will also be zero terminated.
 	///
 	/// \return Pointer to duplicated string; or nullptr if str is nullptr. Use delete[] operator to free the memory.
 	///