diff --git a/core/installer/schema.go b/core/installer/schema.go
index fb5d305..c7f7196 100644
--- a/core/installer/schema.go
+++ b/core/installer/schema.go
@@ -383,7 +383,7 @@
 		// TODO(gio): handle numbers
 		return nil, fmt.Errorf("implement: %s", v)
 	case cue.IntKind:
-		if d, ok := v.Default(); ok {
+		if d, ok := v.Default(); ok || d.IsConcrete() {
 			return d.Int64()
 		}
 	case cue.ListKind: