diff --git a/client.js b/client.js
index 9a43b738..d84c0d71 100644
--- a/client.js
+++ b/client.js
@@ -736,8 +736,8 @@ function instanceManagement() {
 				var inventoryFrame = {};
 				for (let i = 0; i < inventory.length; i++) {
 					inventoryFrame[inventory[i].name] = Number(inventory[i].count);
-					if(inventoryFrame[inventory[i].name] >= 2 ** 31){
-						inventoryFrame[inventory[i].name] = 2 ** 30; // set it waaay lower, -1 would probably suffice
+					if(inventoryFrame[inventory[i].name] >= Math.pow(2, 31)){
+						inventoryFrame[inventory[i].name] = Math.pow(2, 30); // set it waaay lower, 31 -1 would probably suffice
 					}
 				}
 				inventoryFrame["signal-unixtime"] = Math.floor(Date.now()/1000);