diff --git a/OpenRA.Mods.Common/Projectiles/LaserZap.cs b/OpenRA.Mods.Common/Projectiles/LaserZap.cs
index 1882735193..bc59636e5b 100644
--- a/OpenRA.Mods.Common/Projectiles/LaserZap.cs
+++ b/OpenRA.Mods.Common/Projectiles/LaserZap.cs
@@ -41,7 +41,7 @@ namespace OpenRA.Mods.Common.Projectiles
 		public readonly Color Color = Color.Red;
 
 		[Desc("Beam follows the target.")]
-		public readonly bool TracksTarget = true;
+		public readonly bool TrackTarget = true;
 
 		[Desc("Maximum offset at the maximum range.")]
 		public readonly WDist Inaccuracy = WDist.Zero;
@@ -120,7 +120,7 @@ namespace OpenRA.Mods.Common.Projectiles
 		public void Tick(World world)
 		{
 			// Beam tracks target
-			if (info.TracksTarget && args.GuidedTarget.IsValidFor(args.SourceActor))
+			if (info.TrackTarget && args.GuidedTarget.IsValidFor(args.SourceActor))
 				target = args.GuidedTarget.CenterPosition;
 
 			// Check for blocking actors
diff --git a/OpenRA.Mods.Common/UtilityCommands/UpgradeRules.cs b/OpenRA.Mods.Common/UtilityCommands/UpgradeRules.cs
index 5d3b98b58e..bef16aec33 100644
--- a/OpenRA.Mods.Common/UtilityCommands/UpgradeRules.cs
+++ b/OpenRA.Mods.Common/UtilityCommands/UpgradeRules.cs
@@ -751,14 +751,14 @@ namespace OpenRA.Mods.Common.UtilityCommands
 				}
 
 				// Rename LaserZap BeamDuration to just Duration
-				if (engineVersion < 20161009)
+				if (engineVersion < 20161020)
 				{
 					if (node.Key == "BeamDuration")
 						node.Key = "Duration";
 				}
 
 				// Rename Bullet Angle to LaunchAngle
-				if (engineVersion < 20161016)
+				if (engineVersion < 20161020)
 				{
 					if (node.Key == "Angle")
 						node.Key = "LaunchAngle";
@@ -774,6 +774,13 @@ namespace OpenRA.Mods.Common.UtilityCommands
 					}
 				}
 
+				// Rename LaserZap TracksTarget to TrackTarget
+				if (engineVersion < 20161217)
+				{
+					if (node.Key == "TracksTarget")
+						node.Key = "TrackTarget";
+				}
+
 				UpgradeWeaponRules(modData, engineVersion, ref node.Value.Nodes, node, depth + 1);
 			}
 		}