diff --git a/crates/project/src/fs.rs b/crates/project/src/fs.rs
index 85c0e45fb002a606907a16bec3af9c6cb5b59d8f..895d7d4cc1a0b440a4ca92f63ebed1284f025365 100644
--- a/crates/project/src/fs.rs
+++ b/crates/project/src/fs.rs
@@ -134,6 +134,7 @@ impl Fs for RealFs {
     }
 }
 
+#[cfg(any(test, feature = "test-support"))]
 #[derive(Clone, Debug)]
 struct FakeFsEntry {
     metadata: Metadata,