diff --git a/include/rpcasync.h b/include/rpcasync.h
index d4bf4f8225c..f0bcb6d0b3d 100644
--- a/include/rpcasync.h
+++ b/include/rpcasync.h
@@ -18,6 +18,13 @@
 #ifndef __WINE_RPCASYNC_H
 #define __WINE_RPCASYNC_H
 
+#ifdef RPC_NO_WINDOWS_H
+# include <windef.h>
+#endif
+
+#ifdef __RPC_WIN64__
+# include <pshpack8.h>
+#endif
 
 typedef struct tagRPC_ERROR_ENUM_HANDLE
 {
@@ -154,6 +161,10 @@ typedef struct _RPC_ASYNC_STATE
 
 #define RpcAsyncGetCallHandle(async) (((PRPC_ASYNC_STATE)async)->RuntimeInfo)
 
+#ifdef __RPC_WIN64__
+# include <poppack.h>
+#endif
+
 #ifdef __cplusplus
 extern "C" {
 #endif