diff --git a/src/lib.rs b/src/lib.rs
index 7ef4c75..f409e48 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -84,7 +84,8 @@ impl<Stream: AsFd> IsTerminal for Stream {
     fn is_terminal(&self) -> bool {
         #[cfg(any(unix, target_os = "wasi"))]
         {
-            unsafe { libc::isatty(self.as_fd().as_raw_fd()) == 1 }
+            let fd = self.as_fd();
+            unsafe { libc::isatty(fd.as_raw_fd()) != 0 }
         }
 
         #[cfg(target_os = "hermit")]
@@ -104,8 +105,8 @@ impl<Stream: AsHandle> IsTerminal for Stream {
 }
 
 // The Windows implementation here is copied from `handle_is_console` in
-// std/src/sys/windows/io.rs in Rust at revision
-// d7b0bcb20f2f7d5f3ea3489d56ece630147e98f5.
+// library/std/src/sys/pal/windows/io.rs in Rust at revision
+// 99128b7e45f8b95d962da2e6ea584767f0c85455.
 
 #[cfg(windows)]
 fn handle_is_console(handle: BorrowedHandle<'_>) -> bool {
@@ -147,8 +148,6 @@ fn handle_is_console(handle: BorrowedHandle<'_>) -> bool {
 }
 
 /// Returns true if there is an MSYS tty on the given handle.
-///
-/// This incoproates d7b0bcb20f2f7d5f3ea3489d56ece630147e98f5
 #[cfg(windows)]
 unsafe fn msys_tty_on(handle: HANDLE) -> bool {
     use std::ffi::c_void;