diff --git a/include/uv-win.h b/include/uv-win.h
index eea48cfc..378267a0 100644
--- a/include/uv-win.h
+++ b/include/uv-win.h
@@ -471,8 +471,7 @@ RB_HEAD(uv_timer_tree_s, uv_timer_s);
   } pending_ipc_info;                                                         \
   uv_write_t* non_overlapped_writes_tail;                                     \
   uv_mutex_t readfile_mutex;                                                  \
-  volatile HANDLE readfile_thread;                                            \
-  void* reserved;
+  volatile HANDLE readfile_thread;
 
 #define UV_PIPE_PRIVATE_FIELDS                                                \
   HANDLE handle;                                                              \