diff --git a/tools/net/ynl/lib/ynl.py b/tools/net/ynl/lib/ynl.py
index aa77bcae4807..3144f33196be 100644
--- a/tools/net/ynl/lib/ynl.py
+++ b/tools/net/ynl/lib/ynl.py
@@ -591,8 +591,9 @@ class YnlFamily(SpecFamily):
                         print('Unexpected message: ' + repr(gm))
                         continue
 
-                rsp.append(self._decode(gm.raw_attrs, op.attr_set.name)
-                           | gm.fixed_header_attrs)
+                rsp_msg = self._decode(gm.raw_attrs, op.attr_set.name)
+                rsp_msg.update(gm.fixed_header_attrs)
+                rsp.append(rsp_msg)
 
         if not rsp:
             return None