diff --git a/host/python/uhd/rfnoc_utils/templates/blocktool/descriptor.yml.mako b/host/python/uhd/rfnoc_utils/templates/blocktool/descriptor.yml.mako
index 2ce356815..da7817b49 100644
--- a/host/python/uhd/rfnoc_utils/templates/blocktool/descriptor.yml.mako
+++ b/host/python/uhd/rfnoc_utils/templates/blocktool/descriptor.yml.mako
@@ -96,6 +96,7 @@ data:
   outputs:
     # This will generate one or more ports all called 'out'. It is also
     # possible to have multiple ports with different names.
+    out:
 %    if data_iface_type == 'axis_data':
       num_ports: ${ num_outputs }
       item_width: ${ out_item_width }