diff --git a/src/shrpx_http2_session.cc b/src/shrpx_http2_session.cc
index 48046251..7aaa4bc8 100644
--- a/src/shrpx_http2_session.cc
+++ b/src/shrpx_http2_session.cc
@@ -1284,7 +1284,7 @@ int Http2Session::send()
 
   if(nghttp2_session_want_read(session_) == 0 &&
      nghttp2_session_want_write(session_) == 0 &&
-     evbuffer_get_length(bufferevent_get_output(bev_)) == 0) {
+     evbuffer_get_length(output) == 0) {
     if(LOG_ENABLED(INFO)) {
       SSLOG(INFO, this) << "No more read/write for this session";
     }