diff --git a/OpenRA.Game/Traits/TraitsInterfaces.cs b/OpenRA.Game/Traits/TraitsInterfaces.cs
index 9ae96f8f76..442aab89a3 100644
--- a/OpenRA.Game/Traits/TraitsInterfaces.cs
+++ b/OpenRA.Game/Traits/TraitsInterfaces.cs
@@ -59,7 +59,7 @@ namespace OpenRA.Traits
 	
 	public interface IRadarVisibilityModifier { bool VisibleOnRadar(Actor self); }
 	public interface IRadarColorModifier { Color RadarColorOverride(Actor self); }
-	
+	public interface IRevealShroud {}
 	public interface IOccupySpace
 	{
 		int2 TopLeft { get; }
diff --git a/OpenRA.Game/Traits/World/Shroud.cs b/OpenRA.Game/Traits/World/Shroud.cs
index 4ba5e12db4..45fe0a6ca2 100644
--- a/OpenRA.Game/Traits/World/Shroud.cs
+++ b/OpenRA.Game/Traits/World/Shroud.cs
@@ -14,6 +14,7 @@ using System.Drawing;
 using System.Linq;
 using OpenRA.FileFormats;
 using OpenRA.GameRules;
+using OpenRA.Traits;
 
 namespace OpenRA.Traits
 {
@@ -63,7 +64,14 @@ namespace OpenRA.Traits
 
 		void AddActor(Actor a)
 		{
-			if (a.Owner == null || a.Owner != a.Owner.World.LocalPlayer) return;
+			if (a.traits.WithInterface<IRevealShroud>().Count() == 0)
+				return;
+			
+			bool shareShroud = true; // Todo: make this a server flag
+			
+			if (a.Owner == null || a.Owner.World.LocalPlayer == null 
+			    || a.Owner.Stances[a.Owner.World.LocalPlayer] != Stance.Ally) return;
+			if (!shareShroud &&  a.Owner != a.Owner.World.LocalPlayer) return;
 
 			if (vis.ContainsKey(a))
 			{
diff --git a/OpenRA.Mods.RA/RevealsShroud.cs b/OpenRA.Mods.RA/RevealsShroud.cs
index cb16ccac3f..77f66d5967 100644
--- a/OpenRA.Mods.RA/RevealsShroud.cs
+++ b/OpenRA.Mods.RA/RevealsShroud.cs
@@ -14,7 +14,7 @@ namespace OpenRA.Mods.RA
 {
 	class RevealsShroudInfo : TraitInfo<RevealsShroud> { }
 
-	class RevealsShroud : ITick
+	class RevealsShroud : ITick, IRevealShroud
 	{
 		int2 previousLocation;