diff --git a/src/os/win32/ngx_win32_init.c b/src/os/win32/ngx_win32_init.c
index 70bee8ef4..3249fb293 100644
--- a/src/os/win32/ngx_win32_init.c
+++ b/src/os/win32/ngx_win32_init.c
@@ -240,7 +240,7 @@ ngx_os_init(ngx_log_t *log)
         goto nopoll;
     }
 
-    WSAPoll = (ngx_wsapoll_pt) GetProcAddress(hmod, "WSAPoll");
+    WSAPoll = (ngx_wsapoll_pt) (void *) GetProcAddress(hmod, "WSAPoll");
     if (WSAPoll == NULL) {
         ngx_log_error(NGX_LOG_NOTICE, log, ngx_errno,
                       "GetProcAddress(\"WSAPoll\") failed");