diff --git a/include/rpc.h b/include/rpc.h
index c52e539267d..60bf4fe7adb 100644
--- a/include/rpc.h
+++ b/include/rpc.h
@@ -20,7 +20,11 @@
 
 #ifndef RPC_NO_WINDOWS_H
 # ifdef __WINESRC__
+#  ifndef RC_INVOKED
+#   include <stdarg.h>
+#  endif
 #  include <windef.h>
+#  include <winbase.h>
 # else
 #  include <windows.h>
 # endif