diff --git a/OpenRA.Mods.Cnc/Traits/Render/WithDeliveryAnimation.cs b/OpenRA.Mods.Cnc/Traits/Render/WithDeliveryAnimation.cs
index 6676a486ed..b58f701964 100644
--- a/OpenRA.Mods.Cnc/Traits/Render/WithDeliveryAnimation.cs
+++ b/OpenRA.Mods.Cnc/Traits/Render/WithDeliveryAnimation.cs
@@ -18,9 +18,9 @@ namespace OpenRA.Mods.Cnc.Traits.Render
 	[Desc("Building animation to play when ProductionAirdrop is used to deliver units.")]
 	public class WithDeliveryAnimationInfo : ITraitInfo, Requires<WithSpriteBodyInfo>
 	{
-		public readonly string ActiveSequence = "active";
+		[SequenceReference] public readonly string ActiveSequence = "active";
 
-		public readonly string IdleSequence = "idle";
+		[SequenceReference] public readonly string IdleSequence = "idle";
 
 		public object Create(ActorInitializer init) { return new WithDeliveryAnimation(init.Self, this); }
 	}
diff --git a/OpenRA.Mods.Cnc/Traits/Render/WithRoof.cs b/OpenRA.Mods.Cnc/Traits/Render/WithRoof.cs
index 7659e31c49..6540366e7f 100644
--- a/OpenRA.Mods.Cnc/Traits/Render/WithRoof.cs
+++ b/OpenRA.Mods.Cnc/Traits/Render/WithRoof.cs
@@ -19,7 +19,7 @@ namespace OpenRA.Mods.Cnc.Traits.Render
 	[Desc("Provides an overlay for the Tiberian Dawn hover craft.")]
 	public class WithRoofInfo : ITraitInfo, Requires<RenderSpritesInfo>
 	{
-		public readonly string Sequence = "roof";
+		[SequenceReference] public readonly string Sequence = "roof";
 
 		public object Create(ActorInitializer init) { return new WithRoof(init.Self, this); }
 	}