diff --git a/src/util/simd_types.h b/src/util/simd_types.h
index a6c87db7..64844dcb 100644
--- a/src/util/simd_types.h
+++ b/src/util/simd_types.h
@@ -43,7 +43,7 @@ typedef struct ALIGN_DIRECTIVE {u64a hi; u64a lo;} m128;
 #if defined(HAVE_AVX2)
 typedef __m256i m256;
 #else
-typedef ALIGN_AVX_DIRECTIVE struct {m128 lo; m128 hi;} m256;
+typedef struct ALIGN_AVX_DIRECTIVE {m128 lo; m128 hi;} m256;
 #endif
 
 // these should align to 16 and 32 respectively
diff --git a/unit/internal/simd_utils.cpp b/unit/internal/simd_utils.cpp
index 220d2a12..dac3722e 100644
--- a/unit/internal/simd_utils.cpp
+++ b/unit/internal/simd_utils.cpp
@@ -542,6 +542,7 @@ TYPED_TEST(SimdUtilsTest, load_store) {
 
     auto mem_ptr = make_bytecode_ptr<char>(sizeof(a), alignof(TypeParam));
     char *mem = mem_ptr.get();
+
     ASSERT_EQ(0, (size_t)mem % 16U);
 
     memset(mem, 0, sizeof(a));
@@ -585,6 +586,13 @@ TYPED_TEST(SimdUtilsTest, loadbytes_storebytes) {
     }
 }
 
+TEST(SimdUtilsTest, alignment) {
+    ASSERT_EQ(16, alignof(m128));
+    ASSERT_EQ(32, alignof(m256));
+    ASSERT_EQ(16, alignof(m384));
+    ASSERT_EQ(32, alignof(m512));
+}
+
 TEST(SimdUtilsTest, movq) {
     m128 simd;