diff --git a/src/modules/queue/domain/usecases/formula/queue-time.formula.ts b/src/modules/queue/domain/usecases/formula/queue-time.formula.ts
index 9831e34..a56dd40 100644
--- a/src/modules/queue/domain/usecases/formula/queue-time.formula.ts
+++ b/src/modules/queue/domain/usecases/formula/queue-time.formula.ts
@@ -35,7 +35,7 @@ export class QueueTimeFormula {
     const timeNow = moment().valueOf();
     const lastCall = calledQueue?.call_time ?? timeNow - average;
 
-    const callTime = lastCall + average;
+    const callTime = +lastCall + average;
     const currentQueueCallTime = timeNow > callTime ? timeNow : callTime;
 
     queueTimes[queues[0].id] = currentQueueCallTime;