diff --git a/core/src/com/unciv/logic/civilization/TechManager.kt b/core/src/com/unciv/logic/civilization/TechManager.kt
index 95abc39b73..f1252a438c 100644
--- a/core/src/com/unciv/logic/civilization/TechManager.kt
+++ b/core/src/com/unciv/logic/civilization/TechManager.kt
@@ -335,6 +335,7 @@ class TechManager {
                         city -> CityTileAndDistance(city, tile, tile.aerialDistanceTo(city.getCenterTile()))
                     }
                 }
+                .filter { it.distance <= 5 && (it.tile.getOwner() == null || it.tile.getOwner() == civInfo) }
                 .sortedWith ( compareBy { it.distance } )
                 .distinctBy { it.tile }