--- a/Vc/avx/const.h
+++ b/Vc/avx/const.h
@@ -131,13 +131,13 @@
 #endif
     }
     template <> Vc_ALWAYS_INLINE Vc_CONST Vector<double> Const<double>::highMask(int bits)
     {
 #ifdef Vc_IMPL_AVX2
 #if defined Vc_ICC || defined Vc_MSVC
-        __m256i allone;
+        auto allone = __m256i();
         allone = _mm256_cmpeq_epi8(allone, allone);
 #else
         auto allone = ~__m256i();
 #endif
         return _mm256_castsi256_pd(_mm256_slli_epi64(allone, bits));
 #else