diff --git a/models/issue_dependency.go b/models/issue_dependency.go
index 7a475f517..c688357e1 100644
--- a/models/issue_dependency.go
+++ b/models/issue_dependency.go
@@ -8,12 +8,12 @@ import (
 	"time"
 )
 
-// IssueDependency is connection request for receiving issue notification.
+// IssueDependency represents an issue dependency
 type IssueDependency struct {
 	ID           int64     `xorm:"pk autoincr"`
-	UserID       int64     `xorm:"UNIQUE(watch) NOT NULL"`
-	IssueID      int64     `xorm:"UNIQUE(watch) NOT NULL"`
-	DependencyID int64     `xorm:"UNIQUE(watch) NOT NULL"`
+	UserID       int64     `xorm:"NOT NULL"`
+	IssueID      int64     `xorm:"NOT NULL"`
+	DependencyID int64     `xorm:"NOT NULL"`
 	Created      time.Time `xorm:"-"`
 	CreatedUnix  int64     `xorm:"INDEX created"`
 	Updated      time.Time `xorm:"-"`
diff --git a/models/migrations/v49.go b/models/migrations/v49.go
index 36756d319..2ebc312c1 100644
--- a/models/migrations/v49.go
+++ b/models/migrations/v49.go
@@ -15,9 +15,9 @@ func addIssueDependencyTables(x *xorm.Engine) (err error) {
 
 	type IssueDependency struct {
 		ID           int64     `xorm:"pk autoincr"`
-		UserID       int64     `xorm:"UNIQUE(watch) NOT NULL"`
-		IssueID      int64     `xorm:"UNIQUE(watch) NOT NULL"`
-		DependencyID int64     `xorm:"UNIQUE(watch) NOT NULL"`
+		UserID       int64     `xorm:"NOT NULL"`
+		IssueID      int64     `xorm:"NOT NULL"`
+		DependencyID int64     `xorm:"NOT NULL"`
 		Created      time.Time `xorm:"-"`
 		CreatedUnix  int64     `xorm:"INDEX created"`
 		Updated      time.Time `xorm:"-"`