diff --git a/OpenRA.Mods.Common/Traits/Cargo.cs b/OpenRA.Mods.Common/Traits/Cargo.cs
index 202f901220..854ba45bac 100644
--- a/OpenRA.Mods.Common/Traits/Cargo.cs
+++ b/OpenRA.Mods.Common/Traits/Cargo.cs
@@ -422,12 +422,6 @@ namespace OpenRA.Mods.Common.Traits
 		}
 	}
 
-	[RequireExplicitImplementation]
-	public interface INotifyPassengerEntered { void OnPassengerEntered(Actor self, Actor passenger); }
-
-	[RequireExplicitImplementation]
-	public interface INotifyPassengerExited { void OnPassengerExited(Actor self, Actor passenger); }
-
 	public class RuntimeCargoInit : IActorInit<Actor[]>, ISuppressInitExport
 	{
 		[FieldFromYamlKey]
diff --git a/OpenRA.Mods.Common/TraitsInterfaces.cs b/OpenRA.Mods.Common/TraitsInterfaces.cs
index bc06006e5e..f41b29452d 100644
--- a/OpenRA.Mods.Common/TraitsInterfaces.cs
+++ b/OpenRA.Mods.Common/TraitsInterfaces.cs
@@ -60,6 +60,12 @@ namespace OpenRA.Mods.Common.Traits
 	[RequireExplicitImplementation]
 	public interface INotifyBlockingMove { void OnNotifyBlockingMove(Actor self, Actor blocking); }
 
+	[RequireExplicitImplementation]
+	public interface INotifyPassengerEntered { void OnPassengerEntered(Actor self, Actor passenger); }
+
+	[RequireExplicitImplementation]
+	public interface INotifyPassengerExited { void OnPassengerExited(Actor self, Actor passenger); }
+
 	public interface IUpgradable
 	{
 		IEnumerable<string> UpgradeTypes { get; }