diff --git a/src/modules/unpackfs/unpackfs.schema.yaml b/src/modules/unpackfs/unpackfs.schema.yaml
index 66c7c0da8..0d96fe9cb 100644
--- a/src/modules/unpackfs/unpackfs.schema.yaml
+++ b/src/modules/unpackfs/unpackfs.schema.yaml
@@ -17,4 +17,5 @@ properties:
                 destination: { type: string }
                 excludeFile: { type: string }
                 exclude: { type: array, items: { type: string } }
+                weight: { type: integer, exclusiveMinimum: 0 }
             required: [ source , sourcefs, destination ]