diff --git a/tests/configs/Rust.yaml.j2 b/tests/configs/Rust.yaml.j2
index 40ce080..2a6d91a 100644
--- a/tests/configs/Rust.yaml.j2
+++ b/tests/configs/Rust.yaml.j2
@@ -25,6 +25,7 @@ configurations:
     repositories:
     - name: demo
       url: https://host.docker.internal:{{ 'CARGO_REPO_PORT' | env }}/
+      is_sparse: true
   go:
     repositories: []
   ruby: