diff --git a/avx_mathfun.h b/avx_mathfun.h
index 4c6c181..037d618 100644
--- a/avx_mathfun.h
+++ b/avx_mathfun.h
@@ -32,8 +32,13 @@
 #include <immintrin.h>
 
 /* yes I know, the top of this file is quite ugly */
+#ifdef _MSC_VER /* visual c++ */
+# define ALIGN32_BEG __declspec(align(32))
+# define ALIGN32_END
+#else /* gcc/clang/icc */
 # define ALIGN32_BEG
 # define ALIGN32_END __attribute__((aligned(32)))
+#endif
 
 /* __m128 is ugly to write */
 typedef __m256  v8sf; // vector of 8 float (avx)