diff --git a/android/assets/jsons/Units.json b/android/assets/jsons/Units.json
index fc9451109d..c7a5274d09 100644
--- a/android/assets/jsons/Units.json
+++ b/android/assets/jsons/Units.json
@@ -368,6 +368,7 @@
 		cost: 185,
 		requiredResource:"Iron",
 		requiredTech:"Navigation",
+		obsoleteTech:"Electronics",
 		upgradesTo:"Battleship",
 		hurryCostModifier:20
 	},