diff --git a/src/shrpx_http_downstream_connection.cc b/src/shrpx_http_downstream_connection.cc
index 3ee4d3f1..e67f4955 100644
--- a/src/shrpx_http_downstream_connection.cc
+++ b/src/shrpx_http_downstream_connection.cc
@@ -967,6 +967,8 @@ int HttpDownstreamConnection::process_input(const uint8_t *data,
       downstream_->pause_read(SHRPX_NO_BUFFER);
       return 0;
     }
+
+    return 0;
   }
 
   auto nproc =