diff --git a/config.pbtxt b/config.pbtxt
index c745a92..504259d 100644
--- a/config.pbtxt
+++ b/config.pbtxt
@@ -19,6 +19,7 @@ output [
 
   {
     name: "output0"
+    optional: true
     data_type: TYPE_FP32
     dims: [ 1, 84, 8400 ]