diff --git a/Cargo.toml b/Cargo.toml
index a66ef1856..2a9d45409 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -33,7 +33,7 @@ tempfile = { version = "3.12.0", optional = true }
 log = "0.4.16"
 serde = { version = "1.0.219", features = ["derive"] }
 serde_json = "1.0.140"
-fs4 = { version = "0.8.0", optional = true }
+fs4 = { version = "0.13.1", optional = true }
 levenshtein_automata = "0.2.1"
 uuid = { version = "1.0.0", features = ["v4", "serde"] }
 crossbeam-channel = "0.5.4"
diff --git a/src/directory/mmap_directory.rs b/src/directory/mmap_directory.rs
index 344364944..61e2b6035 100644
--- a/src/directory/mmap_directory.rs
+++ b/src/directory/mmap_directory.rs
@@ -7,7 +7,7 @@ use std::path::{Path, PathBuf};
 use std::sync::{Arc, RwLock, Weak};
 
 use common::StableDeref;
-use fs4::FileExt;
+use fs4::fs_std::FileExt;
 #[cfg(all(feature = "mmap", unix))]
 pub use memmap2::Advice;
 use memmap2::Mmap;
@@ -485,7 +485,9 @@ impl Directory for MmapDirectory {
         if lock.is_blocking {
             file.lock_exclusive().map_err(LockError::wrap_io_error)?;
         } else {
-            file.try_lock_exclusive().map_err(|_| LockError::LockBusy)?
+            if !file.try_lock_exclusive().map_err(|_| LockError::LockBusy)? {
+                return Err(LockError::LockBusy);
+            }
         }
         // dropping the file handle will release the lock.
         Ok(DirectoryLock::from(Box::new(ReleaseLockFile {