diff --git a/src/http/ngx_http_request.c b/src/http/ngx_http_request.c
index e2c2891..1857f59 100644
--- a/src/http/ngx_http_request.c
+++ b/src/http/ngx_http_request.c
@@ -290,6 +290,7 @@
         return;
     }
 
+    c->single_connection = 1;
     r->connection = c;
     r->pipeline = c->pipeline;
     r->header_in = c->buffer;
@@ -1760,9 +1761,11 @@
         c->read->closed = 1;
         c->write->closed = 1;
 
-        ngx_unlock(&c->lock);
-        c->read->locked = 0;
-        c->write->locked = 0;
+        if (c->single_connection) {
+            ngx_unlock(&c->lock);
+            c->read->locked = 0;
+            c->write->locked = 0;
+        }
 
         ngx_mutex_unlock(ngx_posted_events_mutex);
     }