diff --git a/src/plugins/tlspicotls/tls_picotls.c b/src/plugins/tlspicotls/tls_picotls.c
index 581814412c6..d474b7b26f8 100644
--- a/src/plugins/tlspicotls/tls_picotls.c
+++ b/src/plugins/tlspicotls/tls_picotls.c
@@ -514,7 +514,7 @@ picotls_ctx_write (tls_ctx_t * ctx, session_t * app_session,
   if (ctx->app_closed)
     picotls_app_close (ctx);
 
-  return 0;
+  return to_tls_len;
 }
 
 static int