diff --git a/pkg/storage/unified/sql/db/migrations/resource_mig.go b/pkg/storage/unified/sql/db/migrations/resource_mig.go
index b31f617658e..a11e4f81cf1 100644
--- a/pkg/storage/unified/sql/db/migrations/resource_mig.go
+++ b/pkg/storage/unified/sql/db/migrations/resource_mig.go
@@ -114,11 +114,11 @@ func initResourceTables(mg *migrator.Migrator) string {
 	}))
 
 	mg.AddMigration("Add column folder in resource_history", migrator.NewAddColumnMigration(resource_history_table, &migrator.Column{
-		Name: "folder", Type: migrator.DB_NVarchar, Length: 253, Nullable: false, Default: "",
+		Name: "folder", Type: migrator.DB_NVarchar, Length: 253, Nullable: false, Default: "''",
 	}))
 
 	mg.AddMigration("Add column folder in resource", migrator.NewAddColumnMigration(resource_table, &migrator.Column{
-		Name: "folder", Type: migrator.DB_NVarchar, Length: 253, Nullable: false, Default: "",
+		Name: "folder", Type: migrator.DB_NVarchar, Length: 253, Nullable: false, Default: "''",
 	}))
 
 	return marker