diff --git a/projects/crates.io/cpz/package.yml b/projects/crates.io/cpz/package.yml
index d5f0b279..7744a1a5 100644
--- a/projects/crates.io/cpz/package.yml
+++ b/projects/crates.io/cpz/package.yml
@@ -23,3 +23,7 @@ test:
     - echo aaa > a/b/c/d/e/g
     - cpz a a2
     - difft a a2 --check-only --exit-code
+  env:
+    # secret option to prevent issues in docker
+    # https://github.com/SUPERCILEX/fuc/commit/ef296f106dd29097e8b88bd706597c79d3ed7e1d
+    NO_UNSHARE: 1