diff --git a/reactos/include/psdk/ks.h b/reactos/include/psdk/ks.h
index b7f055102db..f728bfb0f78 100644
--- a/reactos/include/psdk/ks.h
+++ b/reactos/include/psdk/ks.h
@@ -2987,6 +2987,9 @@ struct _KSNODE_DESCRIPTOR
   const KSAUTOMATION_TABLE*  AutomationTable;
   const GUID*  Type;
   const GUID*  Name;
+#if !defined(_WIN64)
+    PVOID Alignment;
+#endif
 };
 
 struct _KSFILTER_DESCRIPTOR