diff --git a/src/http/ngx_http_upstream.c b/src/http/ngx_http_upstream.c
index 9cbec1f..04bfc72 100644
--- a/src/http/ngx_http_upstream.c
+++ b/src/http/ngx_http_upstream.c
@@ -4366,6 +4366,8 @@
         u->buffer.last = u->buffer.pos;
     }
 
+    r->read_event_handler = ngx_http_block_reading;
+
     if (rc == NGX_DECLINED) {
         return;
     }