diff --git a/src/shrpx_http2_upstream.cc b/src/shrpx_http2_upstream.cc
index 3c0c8d28..4c4ef0cc 100644
--- a/src/shrpx_http2_upstream.cc
+++ b/src/shrpx_http2_upstream.cc
@@ -929,6 +929,7 @@ int Http2Upstream::downstream_read(DownstreamConnection *dconn) {
     }
     if (rv == SHRPX_ERR_DCONN_CANCELED) {
       downstream->pop_downstream_connection();
+      handler_->signal_write();
       return 0;
     }
     if (rv != 0) {
diff --git a/src/shrpx_spdy_upstream.cc b/src/shrpx_spdy_upstream.cc
index f8d59ea1..b3ef81be 100644
--- a/src/shrpx_spdy_upstream.cc
+++ b/src/shrpx_spdy_upstream.cc
@@ -602,6 +602,7 @@ int SpdyUpstream::downstream_read(DownstreamConnection *dconn) {
     }
     if (rv == SHRPX_ERR_DCONN_CANCELED) {
       downstream->pop_downstream_connection();
+      handler_->signal_write();
       return 0;
     }
     if (rv != 0) {