diff --git a/Cargo.lock b/Cargo.lock
index 1a9269ddcb0..ce852b571cb 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -4339,8 +4339,8 @@ dependencies = [
  "clap",
  "codspeed-divan-compat",
  "fluent",
- "nix",
  "rustc-hash",
+ "rustix",
  "string-interner",
  "thiserror 2.0.18",
  "uucore",
diff --git a/src/uu/tsort/Cargo.toml b/src/uu/tsort/Cargo.toml
index 84a31349643..227cab634ea 100644
--- a/src/uu/tsort/Cargo.toml
+++ b/src/uu/tsort/Cargo.toml
@@ -28,7 +28,7 @@ uucore = { workspace = true }
 rustc-hash = { workspace = true }
 
 [target.'cfg(unix)'.dependencies]
-nix = { workspace = true, features = ["fs"] }
+rustix = { workspace = true, features = ["fs"] }
 
 [[bin]]
 name = "tsort"
diff --git a/src/uu/tsort/src/tsort.rs b/src/uu/tsort/src/tsort.rs
index a689cd05be4..5b2fb66d6d5 100644
--- a/src/uu/tsort/src/tsort.rs
+++ b/src/uu/tsort/src/tsort.rs
@@ -87,14 +87,14 @@ pub fn uumain(args: impl uucore::Args) -> UResult<()> {
                 target_os = "freebsd",
             ))]
             {
-                use nix::fcntl::{PosixFadviseAdvice, posix_fadvise};
+                use rustix::fs::{Advice, fadvise};
                 use std::os::unix::io::AsFd;
 
-                posix_fadvise(
+                fadvise(
                     file.as_fd(),
-                    0, // offset 0 => from the start of the file
-                    0, // length 0 => for the whole file
-                    PosixFadviseAdvice::POSIX_FADV_SEQUENTIAL,
+                    0,    // offset 0 => from the start of the file
+                    None, // None => for the whole file
+                    Advice::Sequential,
                 )
                 .ok();
             }