diff --git a/OpenRA.Game/Traits/TraitsInterfaces.cs b/OpenRA.Game/Traits/TraitsInterfaces.cs
index 2bd53f5e0a..b3c4c737b4 100644
--- a/OpenRA.Game/Traits/TraitsInterfaces.cs
+++ b/OpenRA.Game/Traits/TraitsInterfaces.cs
@@ -264,6 +264,7 @@ namespace OpenRA.Traits
 		WDist LargestBlockingActorRadius { get; }
 	}
 
+	[RequireExplicitImplementation]
 	public interface IRenderModifier
 	{
 		IEnumerable<IRenderable> ModifyRender(Actor self, WorldRenderer wr, IEnumerable<IRenderable> r);
diff --git a/OpenRA.Mods.Common/Traits/Modifiers/FrozenUnderFog.cs b/OpenRA.Mods.Common/Traits/Modifiers/FrozenUnderFog.cs
index d30e5148a4..b4e8d2be7d 100644
--- a/OpenRA.Mods.Common/Traits/Modifiers/FrozenUnderFog.cs
+++ b/OpenRA.Mods.Common/Traits/Modifiers/FrozenUnderFog.cs
@@ -147,7 +147,7 @@ namespace OpenRA.Mods.Common.Traits
 			}
 		}
 
-		public IEnumerable<IRenderable> ModifyRender(Actor self, WorldRenderer wr, IEnumerable<IRenderable> r)
+		IEnumerable<IRenderable> IRenderModifier.ModifyRender(Actor self, WorldRenderer wr, IEnumerable<IRenderable> r)
 		{
 			return IsVisible(self, self.World.RenderPlayer) || isRendering ? r : SpriteRenderable.None;
 		}
diff --git a/OpenRA.Mods.Common/Traits/Modifiers/WithColoredOverlay.cs b/OpenRA.Mods.Common/Traits/Modifiers/WithColoredOverlay.cs
index 3dc891ca25..77765ff6e3 100644
--- a/OpenRA.Mods.Common/Traits/Modifiers/WithColoredOverlay.cs
+++ b/OpenRA.Mods.Common/Traits/Modifiers/WithColoredOverlay.cs
@@ -30,7 +30,7 @@ namespace OpenRA.Mods.Common.Traits
 		public WithColoredOverlay(WithColoredOverlayInfo info)
 			: base(info) { }
 
-		public IEnumerable<IRenderable> ModifyRender(Actor self, WorldRenderer wr, IEnumerable<IRenderable> r)
+		IEnumerable<IRenderable> IRenderModifier.ModifyRender(Actor self, WorldRenderer wr, IEnumerable<IRenderable> r)
 		{
 			if (IsTraitDisabled)
 				return r;
diff --git a/OpenRA.Mods.Common/Traits/Render/Hovers.cs b/OpenRA.Mods.Common/Traits/Render/Hovers.cs
index 9dac304f16..61de8d65fd 100644
--- a/OpenRA.Mods.Common/Traits/Render/Hovers.cs
+++ b/OpenRA.Mods.Common/Traits/Render/Hovers.cs
@@ -39,7 +39,7 @@ namespace OpenRA.Mods.Common.Traits.Render
 			this.info = info;
 		}
 
-		public IEnumerable<IRenderable> ModifyRender(Actor self, WorldRenderer wr, IEnumerable<IRenderable> r)
+		IEnumerable<IRenderable> IRenderModifier.ModifyRender(Actor self, WorldRenderer wr, IEnumerable<IRenderable> r)
 		{
 			if (self.World.Paused || IsTraitDisabled)
 				return r;