diff --git a/models/actions/task.go b/models/actions/task.go
index 6e77db1b18..f272d4d696 100644
--- a/models/actions/task.go
+++ b/models/actions/task.go
@@ -25,7 +25,7 @@ import (
 // ActionTask represents a distribution of job
 type ActionTask struct {
 	ID       int64
-	JobID    int64
+	JobID    int64             `xorm:"index"`
 	Job      *ActionRunJob     `xorm:"-"`
 	Steps    []*ActionTaskStep `xorm:"-"`
 	Attempt  int64