diff --git a/CookieMonster.js b/CookieMonster.js
index 7ee4765..45333e9 100644
--- a/CookieMonster.js
+++ b/CookieMonster.js
@@ -2035,7 +2035,7 @@ CM.ReplaceNative = function() {
 	Game.RebuildUpgrades = function() {
 		CM.Backup.RebuildUpgrades();
 		CM.Disp.AddTooltipUpgrade();
-		Game.recalculateGains = 1;
+		CM.Sim.DoSims = 1;
 	}
 	
 	CM.Backup.UpdateMenu = Game.UpdateMenu;
diff --git a/src/Main.js b/src/Main.js
index 17adab5..17b94b1 100644
--- a/src/Main.js
+++ b/src/Main.js
@@ -54,7 +54,7 @@ CM.ReplaceNative = function() {
 	Game.RebuildUpgrades = function() {
 		CM.Backup.RebuildUpgrades();
 		CM.Disp.AddTooltipUpgrade();
-		Game.recalculateGains = 1;
+		CM.Sim.DoSims = 1;
 	}
 	
 	CM.Backup.UpdateMenu = Game.UpdateMenu;