diff --git a/OpenRA.Game/Network/SyncReport.cs b/OpenRA.Game/Network/SyncReport.cs
index c41c719730..f611a29367 100755
--- a/OpenRA.Game/Network/SyncReport.cs
+++ b/OpenRA.Game/Network/SyncReport.cs
@@ -37,7 +37,7 @@ namespace OpenRA.Network
 			report.Frame = orderManager.NetFrameNumber;
 			report.SyncedRandom = orderManager.world.SharedRandom.Last;
 			report.Traits.Clear();
-			foreach (var a in orderManager.world.Queries.WithTrait<object>())
+			foreach (var a in orderManager.world.Queries.WithTrait<ISync>())
 			{
 				var sync = Sync.CalculateSyncHash(a.Trait);
 				if (sync != 0)
diff --git a/OpenRA.Game/World.cs b/OpenRA.Game/World.cs
index c2b6adbeb5..21688210a0 100644
--- a/OpenRA.Game/World.cs
+++ b/OpenRA.Game/World.cs
@@ -195,7 +195,7 @@ namespace OpenRA
 					ret += n++ * (int)(1+a.ActorID) * Sync.CalculateSyncHash(a);
 
 				// hash all the traits that tick
-				foreach (var x in traitDict.ActorsWithTraitMultiple<object>(this))
+				foreach (var x in traitDict.ActorsWithTraitMultiple<ISync>(this))
 					ret += n++*(int) (1+x.Actor.ActorID)*Sync.CalculateSyncHash(x.Trait);
 
 				// Hash the shared rng