diff --git a/OpenRA.Mods.Common/Traits/BlocksProjectiles.cs b/OpenRA.Mods.Common/Traits/BlocksProjectiles.cs
index eaa3d749e1..8ef72a925b 100644
--- a/OpenRA.Mods.Common/Traits/BlocksProjectiles.cs
+++ b/OpenRA.Mods.Common/Traits/BlocksProjectiles.cs
@@ -14,14 +14,8 @@ using OpenRA.Traits;
 
 namespace OpenRA.Mods.Common.Traits
 {
-	[RequireExplicitImplementation]
-	public interface IBlocksProjectiles
-	{
-		WDist BlockingHeight { get; }
-	}
-
 	[Desc("This actor blocks bullets and missiles with 'Blockable' property.")]
-	public class BlocksProjectilesInfo : ConditionalTraitInfo
+	public class BlocksProjectilesInfo : ConditionalTraitInfo, IBlocksProjectilesInfo
 	{
 		public readonly WDist Height = WDist.FromCells(1);
 
diff --git a/OpenRA.Mods.Common/Traits/Buildings/Gate.cs b/OpenRA.Mods.Common/Traits/Buildings/Gate.cs
index 771b1e4ba2..76691d667f 100644
--- a/OpenRA.Mods.Common/Traits/Buildings/Gate.cs
+++ b/OpenRA.Mods.Common/Traits/Buildings/Gate.cs
@@ -16,7 +16,7 @@ using OpenRA.Traits;
 namespace OpenRA.Mods.Common.Traits
 {
 	[Desc("Will open and be passable for actors that appear friendly when there are no enemies in range.")]
-	public class GateInfo : BuildingInfo
+	public class GateInfo : BuildingInfo, IBlocksProjectilesInfo
 	{
 		public readonly string OpeningSound = null;
 		public readonly string ClosingSound = null;
@@ -28,7 +28,7 @@ namespace OpenRA.Mods.Common.Traits
 		public readonly int TransitionDelay = 33;
 
 		[Desc("Blocks bullets scaled to open value.")]
-		public readonly int BlocksProjectilesHeight = 640;
+		public readonly WDist BlocksProjectilesHeight = new WDist(640);
 
 		public override object Create(ActorInitializer init) { return new Gate(init, this); }
 	}
@@ -129,7 +129,7 @@ namespace OpenRA.Mods.Common.Traits
 		{
 			get
 			{
-				return new WDist(info.BlocksProjectilesHeight * (OpenPosition - Position) / OpenPosition);
+				return new WDist(info.BlocksProjectilesHeight.Length * (OpenPosition - Position) / OpenPosition);
 			}
 		}
 	}
diff --git a/OpenRA.Mods.Common/TraitsInterfaces.cs b/OpenRA.Mods.Common/TraitsInterfaces.cs
index 0fb9d5261b..32c5240df6 100644
--- a/OpenRA.Mods.Common/TraitsInterfaces.cs
+++ b/OpenRA.Mods.Common/TraitsInterfaces.cs
@@ -38,6 +38,15 @@ namespace OpenRA.Mods.Common.Traits
 		IEnumerable<IRenderable> Render(WorldRenderer wr, World w, ActorInfo ai, WPos centerPosition);
 	}
 
+	[RequireExplicitImplementation]
+	public interface IBlocksProjectiles
+	{
+		WDist BlockingHeight { get; }
+	}
+
+	[RequireExplicitImplementation]
+	public interface IBlocksProjectilesInfo : ITraitInfoInterface { }
+
 	[RequireExplicitImplementation]
 	public interface INotifySold
 	{