diff --git a/attic/src/lib.rs b/attic/src/lib.rs
index 43b0f26..05c1f52 100644
--- a/attic/src/lib.rs
+++ b/attic/src/lib.rs
@@ -24,6 +24,7 @@ pub mod nix_store;
 pub mod signing;
 #[cfg(feature = "tokio")]
 pub mod stream;
+#[cfg(target_family = "unix")]
 pub mod testing;
 #[cfg(feature = "tokio")]
 pub mod util;