diff --git a/src/js/game/systems/logic_gate.js b/src/js/game/systems/logic_gate.js
index 1b04bf9a..3bfc20cd 100644
--- a/src/js/game/systems/logic_gate.js
+++ b/src/js/game/systems/logic_gate.js
@@ -117,7 +117,7 @@ export class LogicGateSystem extends GameSystemWithFilter {
      */
     compute_XOR(parameters) {
         assert(parameters.length === 2, "bad parameter count for XOR");
-        return isTruthyItem(parameters[0]) ^ isTruthyItem(parameters[1])
+        return isTruthyItem(parameters[0]) !== isTruthyItem(parameters[1])
             ? BOOL_TRUE_SINGLETON
             : BOOL_FALSE_SINGLETON;
     }