diff --git a/OpenRA.Mods.Common/Traits/Render/WithRepairAnimation.cs b/OpenRA.Mods.Common/Traits/Render/WithRepairAnimation.cs
index 7e4eecd030..d42abf1a1a 100644
--- a/OpenRA.Mods.Common/Traits/Render/WithRepairAnimation.cs
+++ b/OpenRA.Mods.Common/Traits/Render/WithRepairAnimation.cs
@@ -27,7 +27,7 @@ namespace OpenRA.Mods.Common.Traits
 
 	public class WithRepairAnimation : INotifyRepair
 	{
-		WithRepairAnimationInfo info;
+		readonly WithRepairAnimationInfo info;
 
 		public WithRepairAnimation(Actor self, WithRepairAnimationInfo info)
 		{