diff --git a/models/forgejo_migrations/v26.go b/models/forgejo_migrations/v26.go
index 5efe48a302..3292d93ffd 100644
--- a/models/forgejo_migrations/v26.go
+++ b/models/forgejo_migrations/v26.go
@@ -7,8 +7,8 @@ import "xorm.io/xorm"
 
 func AddHashBlake2bToPackageBlob(x *xorm.Engine) error {
 	type PackageBlob struct {
-		ID          int64 `xorm:"pk autoincr"`
-		HashBlake2b string
+		ID          int64  `xorm:"pk autoincr"`
+		HashBlake2b string `xorm:"hash_blake2b char(128) UNIQUE(blake2b) INDEX"`
 	}
 	return x.Sync(&PackageBlob{})
 }