diff --git a/OpenRA.Game/Traits/TraitsInterfaces.cs b/OpenRA.Game/Traits/TraitsInterfaces.cs
index a6efcff4cb..692b44a457 100644
--- a/OpenRA.Game/Traits/TraitsInterfaces.cs
+++ b/OpenRA.Game/Traits/TraitsInterfaces.cs
@@ -95,6 +95,8 @@ namespace OpenRA.Traits
 	public interface ITick { void Tick(Actor self); }
 	public interface ITickRender { void TickRender(WorldRenderer wr, Actor self); }
 	public interface IRender { IEnumerable<IRenderable> Render(Actor self, WorldRenderer wr); }
+
+	public interface IAutoSelectionSizeInfo : ITraitInfoInterface { }
 	public interface IAutoSelectionSize { int2 SelectionSize(Actor self); }
 
 	public interface IIssueOrder
diff --git a/OpenRA.Mods.Cnc/Traits/Render/WithVoxelUnloadBody.cs b/OpenRA.Mods.Cnc/Traits/Render/WithVoxelUnloadBody.cs
index e84e213691..6c81d55017 100644
--- a/OpenRA.Mods.Cnc/Traits/Render/WithVoxelUnloadBody.cs
+++ b/OpenRA.Mods.Cnc/Traits/Render/WithVoxelUnloadBody.cs
@@ -20,7 +20,7 @@ using OpenRA.Traits;
 
 namespace OpenRA.Mods.Cnc.Traits.Render
 {
-	public class WithVoxelUnloadBodyInfo : ITraitInfo, IRenderActorPreviewVoxelsInfo, Requires<RenderVoxelsInfo>
+	public class WithVoxelUnloadBodyInfo : ITraitInfo, IRenderActorPreviewVoxelsInfo, Requires<RenderVoxelsInfo>, IAutoSelectionSizeInfo
 	{
 		[Desc("Voxel sequence name to use when docked to a refinery.")]
 		public readonly string UnloadSequence = "unload";
diff --git a/OpenRA.Mods.Cnc/Traits/Render/WithVoxelWalkerBody.cs b/OpenRA.Mods.Cnc/Traits/Render/WithVoxelWalkerBody.cs
index 4ec6be8199..2ba41825b7 100644
--- a/OpenRA.Mods.Cnc/Traits/Render/WithVoxelWalkerBody.cs
+++ b/OpenRA.Mods.Cnc/Traits/Render/WithVoxelWalkerBody.cs
@@ -22,7 +22,8 @@ using OpenRA.Traits;
 
 namespace OpenRA.Mods.Cnc.Traits.Render
 {
-	public class WithVoxelWalkerBodyInfo : ITraitInfo, IRenderActorPreviewVoxelsInfo,  Requires<RenderVoxelsInfo>, Requires<IMoveInfo>, Requires<IFacingInfo>
+	public class WithVoxelWalkerBodyInfo : ITraitInfo, IRenderActorPreviewVoxelsInfo,  Requires<RenderVoxelsInfo>, Requires<IMoveInfo>, Requires<IFacingInfo>,
+		IAutoSelectionSizeInfo
 	{
 		public readonly string Sequence = "idle";
 
diff --git a/OpenRA.Mods.Common/Traits/CustomSelectionSize.cs b/OpenRA.Mods.Common/Traits/CustomSelectionSize.cs
index 4f4f4d952c..6e1f8b528b 100644
--- a/OpenRA.Mods.Common/Traits/CustomSelectionSize.cs
+++ b/OpenRA.Mods.Common/Traits/CustomSelectionSize.cs
@@ -14,7 +14,7 @@ using OpenRA.Traits;
 namespace OpenRA.Mods.Common.Traits
 {
 	[Desc("Special case trait for actors that need to define targetable area and screen map bounds manually.")]
-	public class CustomSelectionSizeInfo : ITraitInfo
+	public class CustomSelectionSizeInfo : ITraitInfo, IAutoSelectionSizeInfo
 	{
 		[FieldLoader.Require]
 		public readonly int[] CustomBounds = null;
diff --git a/OpenRA.Mods.Common/Traits/Render/AutoSelectionSize.cs b/OpenRA.Mods.Common/Traits/Render/AutoSelectionSize.cs
index 6ddf821d4d..876172b23f 100644
--- a/OpenRA.Mods.Common/Traits/Render/AutoSelectionSize.cs
+++ b/OpenRA.Mods.Common/Traits/Render/AutoSelectionSize.cs
@@ -14,7 +14,7 @@ using OpenRA.Traits;
 namespace OpenRA.Mods.Common.Traits.Render
 {
 	[Desc("Automatically calculates the targetable area and screen map boundaries from the sprite size.")]
-	public class AutoSelectionSizeInfo : ITraitInfo, Requires<RenderSpritesInfo>
+	public class AutoSelectionSizeInfo : ITraitInfo, Requires<RenderSpritesInfo>, IAutoSelectionSizeInfo
 	{
 		public object Create(ActorInitializer init) { return new AutoSelectionSize(this); }
 	}
diff --git a/OpenRA.Mods.Common/Traits/Render/WithVoxelBody.cs b/OpenRA.Mods.Common/Traits/Render/WithVoxelBody.cs
index d898595357..c1469ea193 100644
--- a/OpenRA.Mods.Common/Traits/Render/WithVoxelBody.cs
+++ b/OpenRA.Mods.Common/Traits/Render/WithVoxelBody.cs
@@ -19,7 +19,7 @@ using OpenRA.Traits;
 namespace OpenRA.Mods.Common.Traits.Render
 {
 	[Desc("Also returns a default selection size that is calculated automatically from the voxel dimensions.")]
-	public class WithVoxelBodyInfo : ConditionalTraitInfo, IRenderActorPreviewVoxelsInfo, Requires<RenderVoxelsInfo>
+	public class WithVoxelBodyInfo : ConditionalTraitInfo, IRenderActorPreviewVoxelsInfo, Requires<RenderVoxelsInfo>, IAutoSelectionSizeInfo
 	{
 		public readonly string Sequence = "idle";