diff --git a/src/mappings/veDelegation.ts b/src/mappings/veDelegation.ts
index a89bc34..fbe3a9e 100644
--- a/src/mappings/veDelegation.ts
+++ b/src/mappings/veDelegation.ts
@@ -30,7 +30,7 @@ export function handleDelegation(event: DelegateBoost): void {
     BigInt.fromI32(18).toI32()
   )
   veDelegation.lockedAmount = delegator.lockedAmount
-  veDelegation.timeLeft = delegator.unlockTime.minus(ts)
+  veDelegation.timeLeft = delegator.unlockTime.toI32().minus(ts)
   veDelegation.cancelTime = _cancelTime
   veDelegation.expireTime = _expireTime
   veDelegation.save()