diff --git a/src/js/futureSocietyJS.js b/src/js/futureSocietyJS.js
index 6c9a4b2454229bf1ccf93f98f11eb5faf56c2fe5..c4d7e32c52309ea33f52e8f22d8acc637481e339 100644
--- a/src/js/futureSocietyJS.js
+++ b/src/js/futureSocietyJS.js
@@ -60,7 +60,7 @@ window.FutureSocieties = (function() {
 
 	// call as FutureSocieties.applyBroadProgress(arcologyID, progress)
 	function applyBroadProgress(arcologyID, progress) {
-		for (fs of activeFSes(arcologyID)) {
+		for (const fs of activeFSes(arcologyID)) {
 			V.arcologies[arcologyID][fs] += progress;
 		}
 	}
@@ -69,7 +69,7 @@ window.FutureSocieties = (function() {
 	// converts excess progress into influence bonus
 	function overflowToInfluence(arcologyID) {
 		const arcology = V.arcologies[arcologyID];
-		for (fs of activeFSes(arcologyID)) {
+		for (const fs of activeFSes(arcologyID)) {
 			if (arcology[fs] > V.FSLockinLevel) {
 				arcology.influenceBonus += arcology[fs] - V.FSLockinLevel;
 				arcology[fs] = V.FSLockinLevel;