diff --git a/OpenRA.Utility/UpgradeRules.cs b/OpenRA.Utility/UpgradeRules.cs
index 6f1fa7a803..bf16b91704 100644
--- a/OpenRA.Utility/UpgradeRules.cs
+++ b/OpenRA.Utility/UpgradeRules.cs
@@ -249,6 +249,12 @@ namespace OpenRA.Utility
 						node.Value.Nodes.Add(new MiniYamlNode("ScriptTriggers", ""));
 				}
 
+				if (engineVersion < 20140517)
+				{
+					if (depth == 0)
+						node.Value.Nodes.RemoveAll(n => n.Key == "TeslaInstantKills");
+				}
+
 				UpgradeActorRules(engineVersion, ref node.Value.Nodes, node, depth + 1);
 			}
 		}
diff --git a/mods/ra/rules/defaults.yaml b/mods/ra/rules/defaults.yaml
index 8c3ddfbcb2..7f23b3980e 100644
--- a/mods/ra/rules/defaults.yaml
+++ b/mods/ra/rules/defaults.yaml
@@ -140,7 +140,6 @@
 	Passenger:
 		CargoType: Infantry
 	HiddenUnderFog:
-	TeslaInstantKills:
 	GainsExperience:
 	GivesExperience:
 	DrawLineToTarget: