diff --git a/src/core/execution/Util.ts b/src/core/execution/Util.ts
index a4a414e89..ed33836f5 100644
--- a/src/core/execution/Util.ts
+++ b/src/core/execution/Util.ts
@@ -119,7 +119,7 @@ export function listNukeBreakAlliance(
 
   // Also check if any allied structures would be destroyed
   game
-    .nearbyUnits(targetTile, magnitude.outer, [...StructureTypes])
+    .nearbyUnits(targetTile, magnitude.outer, StructureTypes)
     .forEach(({ unit }) =>
       playersToBreakAllianceWith.add(unit.owner().smallID()),
     );
diff --git a/src/core/game/Game.ts b/src/core/game/Game.ts
index 5f17f2b01..26395acf5 100644
--- a/src/core/game/Game.ts
+++ b/src/core/game/Game.ts
@@ -793,7 +793,7 @@ export interface Game extends GameMap {
   nearbyUnits(
     tile: TileRef,
     searchRange: number,
-    types: UnitType | UnitType[],
+    types: UnitType | readonly UnitType[],
     predicate?: UnitPredicate,
     includeUnderConstruction?: boolean,
   ): Array<{ unit: Unit; distSquared: number }>;
diff --git a/src/core/game/GameImpl.ts b/src/core/game/GameImpl.ts
index 0f807e3d3..0339fdb33 100644
--- a/src/core/game/GameImpl.ts
+++ b/src/core/game/GameImpl.ts
@@ -895,7 +895,7 @@ export class GameImpl implements Game {
   nearbyUnits(
     tile: TileRef,
     searchRange: number,
-    types: UnitType | UnitType[],
+    types: UnitType | readonly UnitType[],
     predicate?: UnitPredicate,
     includeUnderConstruction?: boolean,
   ): Array<{ unit: Unit; distSquared: number }> {
diff --git a/src/core/game/GameView.ts b/src/core/game/GameView.ts
index 974874ad1..f02e0e10b 100644
--- a/src/core/game/GameView.ts
+++ b/src/core/game/GameView.ts
@@ -711,7 +711,7 @@ export class GameView implements GameMap {
   nearbyUnits(
     tile: TileRef,
     searchRange: number,
-    types: UnitType | UnitType[],
+    types: UnitType | readonly UnitType[],
     predicate?: UnitPredicate,
   ): Array<{ unit: UnitView; distSquared: number }> {
     return this.unitGrid.nearbyUnits(