diff --git a/misc.h b/misc.h
index e3980441..f846e72a 100644
--- a/misc.h
+++ b/misc.h
@@ -423,6 +423,19 @@ inline void memmove_s(void *dest, size_t sizeInBytes, const void *src, size_t co
 # define memmove_s CryptoPP::memmove_s
 #endif
 
+//! \brief Swaps two variables which are arrays
+//! \details C++03 does not provide support for <tt>std::swap(__m128i a, __m128i b)</tt>
+//!   because <tt>__m128i</tt> is an <tt>unsigned long long[2]</tt>. Most compilers
+//!   support it out of the box, but Sun Studio C++ compilers 12.2 and 12.3 do not.
+//! \sa <A HREF="http://stackoverflow.com/q/38417413">How to swap two __m128i variables
+//!   in C++03 given its an opaque type and an array?</A> on Stack Overflow.
+template <class T>
+inline void vec_swap(T& a, T& b)
+{
+	T t;
+	t=a, a=b, b=t;
+}
+
 #endif // __STDC_WANT_SECURE_LIB__
 
 //! \brief Memory block initializer and eraser that attempts to survive optimizations
diff --git a/rijndael.cpp b/rijndael.cpp
index 9139c227..05ba5d57 100644
--- a/rijndael.cpp
+++ b/rijndael.cpp
@@ -275,11 +275,9 @@ void Rijndael::Base::UncheckedSetKey(const byte *userKey, unsigned int keylen, c
 			unsigned int i, j;
 
 #if defined(__SUNPRO_CC) && (__SUNPRO_CC <= 0x5120)
-			// __m128i is an unsigned long long[2], and support for swapping it was not formally added until C++11.
+			// __m128i is an unsigned long long[2], and support for swapping it was not added until C++11.
 			// SunCC 12.1 - 12.3 fail to consume the swap; while SunCC 12.4 consumes it without -std=c++11.
-			__m128i t = *(__m128i *)(rk);
-			*(__m128i *)(rk) = *(__m128i *)(rk+4*m_rounds);
-			*(__m128i *)(rk+4*m_rounds) = t;
+			vec_swap(*(__m128i *)(rk), *(__m128i *)(rk+4*m_rounds));
 #else
 			std::swap(*(__m128i *)(void *)(rk), *(__m128i *)(void *)(rk+4*m_rounds));
 #endif