diff --git a/Cargo.lock b/Cargo.lock
index de54b50704f..012d25256e0 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -4222,7 +4222,6 @@ version = "0.8.0"
 dependencies = [
  "clap",
  "fluent",
- "libc",
  "tempfile",
  "thiserror 2.0.18",
  "uucore",
diff --git a/fuzz/Cargo.lock b/fuzz/Cargo.lock
index 9363e1f46ce..a0ca75cc662 100644
--- a/fuzz/Cargo.lock
+++ b/fuzz/Cargo.lock
@@ -2034,7 +2034,6 @@ version = "0.8.0"
 dependencies = [
  "clap",
  "fluent",
- "libc",
  "thiserror",
  "uucore",
 ]
diff --git a/src/uu/test/Cargo.toml b/src/uu/test/Cargo.toml
index 002e42fd098..db11fc5c0b2 100644
--- a/src/uu/test/Cargo.toml
+++ b/src/uu/test/Cargo.toml
@@ -21,7 +21,6 @@ path = "src/test.rs"
 [dependencies]
 clap = { workspace = true }
 fluent = { workspace = true }
-libc = { workspace = true }
 thiserror = { workspace = true }
 uucore = { workspace = true, features = ["process"] }
 
diff --git a/src/uu/test/src/test.rs b/src/uu/test/src/test.rs
index 92b1dcdde02..ae0fd5e0013 100644
--- a/src/uu/test/src/test.rs
+++ b/src/uu/test/src/test.rs
@@ -230,11 +230,12 @@ fn files(a: &OsStr, b: &OsStr, op: &OsStr) -> ParseResult<bool> {
 }
 
 fn isatty(fd: &OsStr) -> ParseResult<bool> {
+    use std::io::IsTerminal;
     fd.to_str()
         .map(str::trim)
         .and_then(|s| s.parse().ok())
         .ok_or_else(|| ParseError::InvalidInteger(fd.quote().to_string()))
-        .map(|i| unsafe { libc::isatty(i) == 1 })
+        .map(|i| unsafe { std::os::fd::BorrowedFd::borrow_raw(i) }.is_terminal())
 }
 
 #[derive(Eq, PartialEq)]