diff --git a/OpenRA.Mods.RA/CrateAction.cs b/OpenRA.Mods.RA/CrateAction.cs
index 274372384d..d400cb63b8 100644
--- a/OpenRA.Mods.RA/CrateAction.cs
+++ b/OpenRA.Mods.RA/CrateAction.cs
@@ -19,6 +19,7 @@ namespace OpenRA.Mods.RA
 		public int SelectionShares = 10;
 		public string Effect = null;
 		public string Notification = null;
+		[ActorReference]
 		public string[] ExcludedActorTypes = { };
 
 		public virtual object Create(ActorInitializer init) { return new CrateAction(init.self, this); }