--- a/proxy_limit_rate.t
+++ b/proxy_limit_rate.t
@@ -22,7 +22,7 @@ use Test::Nginx;
 select STDERR; $| = 1;
 select STDOUT; $| = 1;
 
-my $t = Test::Nginx->new()->has(qw/http proxy/)->plan(2);
+my $t = Test::Nginx->new()->has(qw/http proxy upstream_keepalive/)->plan(4);
 
 $t->write_file_expand('nginx.conf', <<'EOF');
 
@@ -36,6 +36,11 @@ events {
 http {
     %%TEST_GLOBALS_HTTP%%
 
+    upstream u {
+        server 127.0.0.1:8080;
+        keepalive 1;
+    }
+
     server {
         listen       127.0.0.1:8080;
         server_name  localhost;
@@ -47,6 +52,15 @@ http {
             add_header X-Msec $msec;
         }
 
+        location /keepalive {
+            proxy_http_version 1.1;
+            proxy_set_header Connection "";
+            proxy_pass http://u/data;
+            proxy_buffer_size 4k;
+            proxy_limit_rate 12000;
+            add_header X-Msec $msec;
+        }
+
         location /data {
         }
     }
@@ -69,4 +83,16 @@ my $diff = time() - $t1;
 cmp_ok($diff, '>=', 3, 'proxy_limit_rate');
 like($r, qr/^(XXXXXXXXXX){4000}\x0d?\x0a?$/m, 'response body');
 
+# in case keepalive connection was saved with the delayed flag,
+# the read timer used to be a delay timer in the next request
+
+like(http_get('/keepalive'), qr/200 OK/, 'keepalive');
+
+TODO: {
+local $TODO = 'not yet' unless $t->has_version('1.13.8');
+
+like(http_get('/keepalive'), qr/200 OK/, 'keepalive 2');
+
+}
+
 ###############################################################################