diff --git a/algparam.h b/algparam.h
index 40c5f46e..1b125f02 100644
--- a/algparam.h
+++ b/algparam.h
@@ -53,7 +53,7 @@ public:
 		: m_deepCopy(false), m_data(NULLPTR), m_size(0)
 	{
 		CRYPTOPP_COMPILE_ASSERT(sizeof(typename T::value_type) == 1);
-		Assign(reinterpret_cast<const byte *>(string.data()), string.size(), deepCopy);
+		Assign(reinterpret_cast<const byte *>(&string[0]), string.size(), deepCopy);
 	}
 
 	/// \brief Assign contents from a memory buffer