diff --git a/ui/pages/confirmations/components/confirm/info/approve/hooks/use-approve-token-simulation.ts b/ui/pages/confirmations/components/confirm/info/approve/hooks/use-approve-token-simulation.ts
index e05823738b5c..19f26c9c9300 100644
--- a/ui/pages/confirmations/components/confirm/info/approve/hooks/use-approve-token-simulation.ts
+++ b/ui/pages/confirmations/components/confirm/info/approve/hooks/use-approve-token-simulation.ts
@@ -33,13 +33,14 @@ export const useApproveTokenSimulation = (
       (param) =>
         param.value !== undefined &&
         !isHexString(param.value) &&
+        param.value.length === undefined &&
         !isBoolean(param.value),
     );
     if (paramIndex === -1) {
       return 0;
     }
 
-    return new BigNumber(value.data[0].params[paramIndex].value)
+    return new BigNumber(value.data[0].params[paramIndex].value.toString())
       .dividedBy(new BigNumber(10).pow(Number(decimals)))
       .toNumber();
   }, [value, decimals]);