diff --git a/sdk/include/xdk/amd64/ke.h b/sdk/include/xdk/amd64/ke.h
index 64212336702..b9238ccfd17 100644
--- a/sdk/include/xdk/amd64/ke.h
+++ b/sdk/include/xdk/amd64/ke.h
@@ -272,8 +272,8 @@ typedef struct DECLSPEC_ALIGN(16) _CONTEXT {
       M128A Xmm13;
       M128A Xmm14;
       M128A Xmm15;
-    } DUMMYSTRUCTNAME;
-  } DUMMYUNIONNAME;
+    } DUMMYSTRUCTNAME DECLSPEC_ALIGN(16);
+  } DUMMYUNIONNAME DECLSPEC_ALIGN(16);
   M128A VectorRegister[26];
   ULONG64 VectorControl;
   ULONG64 DebugControl;