diff --git a/OpenRA.Mods.Common/Traits/Render/WithProductionDoorOverlay.cs b/OpenRA.Mods.Common/Traits/Render/WithProductionDoorOverlay.cs
index b6957fd4e0..99308623e9 100644
--- a/OpenRA.Mods.Common/Traits/Render/WithProductionDoorOverlay.cs
+++ b/OpenRA.Mods.Common/Traits/Render/WithProductionDoorOverlay.cs
@@ -19,6 +19,7 @@ namespace OpenRA.Mods.Common.Traits.Render
 	[Desc("Play an animation when a unit exits or blocks the exit after production finished.")]
 	class WithProductionDoorOverlayInfo : ConditionalTraitInfo, IRenderActorPreviewSpritesInfo, Requires<RenderSpritesInfo>, Requires<BodyOrientationInfo>, Requires<BuildingInfo>
 	{
+		[SequenceReference]
 		public readonly string Sequence = "build-door";
 
 		public IEnumerable<IActorPreview> RenderPreviewSprites(ActorPreviewInitializer init, RenderSpritesInfo rs, string image, int facings, PaletteReference p)