--- a/src/os/win32/ngx_os.h
+++ b/src/os/win32/ngx_os.h
@@ -1,4 +1,4 @@
-ifndef _NGX_OS_H_INCLUDED_
+#ifndef _NGX_OS_H_INCLUDED_
 #define _NGX_OS_H_INCLUDED_
 
 
@@ -33,6 +33,11 @@ typedef struct {
 
 int ngx_os_init(ngx_log_t *log);
 
+ssize_t ngx_wsarecv(ngx_connection_t *c, char *buf, size_t size);
+ssize_t ngx_overlapped_wsarecv(ngx_connection_t *c, char *buf, size_t size);
+ngx_chain_t *ngx_wsasend_chain(ngx_connection_t *c, ngx_chain_t *in);
+ngx_chain_t *ngx_overlapped_wsasend_chain(ngx_connection_t *c, ngx_chain_t *in);
+
 
 extern ngx_os_io_t  ngx_os_io;
 extern int          ngx_max_sockets;