diff --git a/src/directory/mod.rs b/src/directory/mod.rs
index 1dda8579e..93c922567 100644
--- a/src/directory/mod.rs
+++ b/src/directory/mod.rs
@@ -42,6 +42,9 @@ pub struct GarbageCollectionResult {
     pub failed_to_delete_files: Vec<PathBuf>,
 }
 
+#[cfg(all(feature = "mmap", unix))]
+pub use memmap2::Advice;
+
 pub use self::managed_directory::ManagedDirectory;
 #[cfg(feature = "mmap")]
 pub use self::mmap_directory::MmapDirectory;