diff --git a/src/reactionsystem.jl b/src/reactionsystem.jl
index 3505e3e42f..83ed069ea0 100644
--- a/src/reactionsystem.jl
+++ b/src/reactionsystem.jl
@@ -229,7 +229,7 @@ const reactionsystem_fields = (
     :eqs, :rxs, :iv, :sivs, :unknowns, :species, :ps, :var_to_name,
     :observed, :name, :systems, :defaults, :connection_type,
     :networkproperties, :combinatoric_ratelaws, :continuous_events,
-    :discrete_events, :metadata, :complete)
+    :discrete_events, :metadata, :complete, :parent)
 
 """
 $(TYPEDEF)