diff --git a/Eigen/src/Core/arch/AVX/PacketMath.h b/Eigen/src/Core/arch/AVX/PacketMath.h
index 0cd9e6cd6c3cb6163aca9495acc0c1d8dbc9a2cc..b1dfb07ff5cfc055fc9ed5901cceee6b04e2e0aa 100644
--- a/Eigen/src/Core/arch/AVX/PacketMath.h
+++ b/Eigen/src/Core/arch/AVX/PacketMath.h
@@ -2831,7 +2831,7 @@ inline __m128i segment_mask_4x8(Index begin, Index count) {
   mask <<= CHAR_BIT * count;
   mask--;
   mask <<= CHAR_BIT * begin;
-#if defined(_WIN32) && !defined(_WIN64)
+#if !EIGEN_ARCH_x86_64
   return _mm_loadl_epi64(reinterpret_cast<const __m128i*>(&mask));
 #else
   return _mm_cvtsi64_si128(mask);
@@ -2847,7 +2847,7 @@ inline __m128i segment_mask_8x8(Index begin, Index count) {
   mask <<= (CHAR_BIT / 2) * count;
   mask--;
   mask <<= CHAR_BIT * begin;
-#if defined(_WIN32) && !defined(_WIN64)
+#if !EIGEN_ARCH_x86_64
   return _mm_loadl_epi64(reinterpret_cast<const __m128i*>(&mask));
 #else
   return _mm_cvtsi64_si128(mask);