diff --git a/server/model/log.go b/server/model/log.go
index acce9f1e0..1e06c8075 100644
--- a/server/model/log.go
+++ b/server/model/log.go
@@ -27,7 +27,7 @@ const (
 
 type LogEntry struct {
 	ID      int64        `json:"id"       xorm:"pk autoincr 'id'"`
-	StepID  int64        `json:"step_id"  xorm:"'step_id'"`
+	StepID  int64        `json:"step_id"  xorm:"INDEX 'step_id'"`
 	Time    int64        `json:"time"`
 	Line    int          `json:"line"`
 	Data    []byte       `json:"data"     xorm:"LONGBLOB"`