diff --git a/core/src/com/unciv/logic/battle/Battle.kt b/core/src/com/unciv/logic/battle/Battle.kt
index 583482c17c..33c5bff1eb 100644
--- a/core/src/com/unciv/logic/battle/Battle.kt
+++ b/core/src/com/unciv/logic/battle/Battle.kt
@@ -157,7 +157,7 @@ object Battle {
         // CS friendship from killing barbarians
         if (defeatedUnit.matchesCategory("Barbarian") && defeatedUnit.matchesCategory("Military") && civUnit.getCivInfo().isMajorCiv()) {
             for (cityState in UncivGame.Current.gameInfo.getAliveCityStates()) {
-                if (defeatedUnit.unit.threatensCiv(cityState)) {
+                if (civUnit.getCivInfo().knows(cityState) && defeatedUnit.unit.threatensCiv(cityState)) {
                     cityState.threateningBarbarianKilledBy(civUnit.getCivInfo())
                 }
             }