diff --git a/src/js/game/systems/logic_gate.js b/src/js/game/systems/logic_gate.js
index 2de11f59..ba5c0c73 100644
--- a/src/js/game/systems/logic_gate.js
+++ b/src/js/game/systems/logic_gate.js
@@ -3,8 +3,9 @@ import { enumColors } from "../colors";
 import { enumLogicGateType, LogicGateComponent } from "../components/logic_gate";
 import { enumPinSlotType } from "../components/wired_pins";
 import { GameSystemWithFilter } from "../game_system_with_filter";
-import { BOOL_FALSE_SINGLETON, BOOL_TRUE_SINGLETON, isTruthyItem } from "../items/boolean_item";
-import { COLOR_ITEM_SINGLETONS } from "../items/color_item";
+import { BOOL_FALSE_SINGLETON, BOOL_TRUE_SINGLETON, BooleanItem, isTruthyItem } from "../items/boolean_item";
+import { COLOR_ITEM_SINGLETONS, ColorItem } from "../items/color_item";
+import { ShapeItem } from "../items/shape_item";
 import { ShapeDefinition } from "../shape_definition";
 
 export class LogicGateSystem extends GameSystemWithFilter {