diff --git a/constant.go b/constant.go
index 668c77d..4c9ce48 100644
--- a/constant.go
+++ b/constant.go
@@ -2,7 +2,7 @@ package queue
 
 // Constant
 const (
-	priorityCritical = "critical"
-	priorityDefault  = "default"
-	priorityLow      = "low"
+	PriorityCritical = "critical"
+	PriorityDefault  = "default"
+	PriorityLow      = "low"
 )
diff --git a/instance.go b/instance.go
index 2e50444..5462e6b 100644
--- a/instance.go
+++ b/instance.go
@@ -52,9 +52,9 @@ func initServer(redisConn asynq.RedisClientOpt, cfg Config) *asynq.ServeMux {
 	server := asynq.NewServer(redisConn, asynq.Config{
 		Concurrency: cfg.Concurrency,
 		Queues: map[string]int{
-			priorityCritical: cfg.Priority.Critical,
-			priorityDefault:  cfg.Priority.Default,
-			priorityLow:      cfg.Priority.Low,
+			PriorityCritical: cfg.Priority.Critical,
+			PriorityDefault:  cfg.Priority.Default,
+			PriorityLow:      cfg.Priority.Low,
 		},
 		StrictPriority: cfg.Priority.StrictMode,
 
diff --git a/task.go b/task.go
index ba5b3e0..aaa86d5 100644
--- a/task.go
+++ b/task.go
@@ -5,11 +5,16 @@ import (
 )
 
 // RunTask ...
-func (i Instance) RunTask(typename string, payload []byte, retryTimes int) (*asynq.TaskInfo, error) {
+func (i Instance) RunTask(typename string, payload []byte, priority string, retryTimes int) (*asynq.TaskInfo, error) {
 	// Create task and options
 	task := asynq.NewTask(typename, payload)
 	options := make([]asynq.Option, 0)
 
+	// Priority
+	if priority != PriorityCritical && priority != PriorityDefault && priority != PriorityLow {
+		priority = PriorityDefault
+	}
+
 	// Retry times
 	if retryTimes < 0 {
 		retryTimes = 0