diff --git a/gcm.cpp b/gcm.cpp
index a5659012..e3e40466 100644
--- a/gcm.cpp
+++ b/gcm.cpp
@@ -94,7 +94,7 @@ __m128i _mm_clmulepi64_si128(const __m128i &a, const __m128i &b, int i)
 #if CRYPTOPP_BOOL_SSE2_INTRINSICS_AVAILABLE || CRYPTOPP_BOOL_SSE2_ASM_AVAILABLE
 inline static void SSE2_Xor16(byte *a, const byte *b, const byte *c)
 {
-#if CRYPTOPP_BOOL_SSE2_INTRINSICS_AVAILABLE
+#if CRYPTOPP_BOOL_SSE2_INTRINSICS_AVAILABLE && !defined(__SUNPRO_CC)
 	CRYPTOPP_ASSERT(IsAlignedOn(a,GetAlignmentOf<__m128i>()));
 	CRYPTOPP_ASSERT(IsAlignedOn(b,GetAlignmentOf<__m128i>()));
 	CRYPTOPP_ASSERT(IsAlignedOn(c,GetAlignmentOf<__m128i>()));