Index: modules/proxy/proxy_util.c
===================================================================
--- modules/proxy/proxy_util.c	(revision 1892663)
+++ modules/proxy/proxy_util.c	(working copy)
@@ -4896,6 +4896,7 @@ PROXY_DECLARE(int) ap_proxy_tunnel_run(proxy_tunne
              */
             if ((tc->pfd->reqevents & APR_POLLOUT)
                     && ((pfd->rtnevents & APR_POLLOUT)
+                        || !(tc->pfd->reqevents & APR_POLLIN)
                         || !(pfd->rtnevents & (APR_POLLIN | APR_POLLHUP)))) {
                 struct proxy_tunnel_conn *out = tc, *in = tc->other;