diff --git a/crates/anstream/src/auto.rs b/crates/anstream/src/auto.rs
index 0976ebb8..9dc56db8 100644
--- a/crates/anstream/src/auto.rs
+++ b/crates/anstream/src/auto.rs
@@ -1,6 +1,5 @@
 #[cfg(feature = "auto")]
 use crate::ColorChoice;
-use crate::IsTerminal;
 use crate::RawStream;
 use crate::StripStream;
 #[cfg(all(windows, feature = "wincon"))]
@@ -158,16 +157,6 @@ fn choice(raw: &dyn RawStream) -> ColorChoice {
     }
 }
 
-impl<S> IsTerminal for AutoStream<S>
-where
-    S: RawStream,
-{
-    #[inline]
-    fn is_terminal(&self) -> bool {
-        self.is_terminal()
-    }
-}
-
 impl AutoStream<std::io::Stdout> {
     /// Get exclusive access to the `AutoStream`
     ///
diff --git a/crates/anstream/src/stream.rs b/crates/anstream/src/stream.rs
index e6f5dde5..754c5b57 100644
--- a/crates/anstream/src/stream.rs
+++ b/crates/anstream/src/stream.rs
@@ -21,7 +21,7 @@ impl RawStream for std::fs::File {}
 
 impl RawStream for crate::Buffer {}
 
-pub trait IsTerminal {
+pub trait IsTerminal: private::Sealed {
     fn is_terminal(&self) -> bool;
 }
 
diff --git a/crates/anstream/src/strip.rs b/crates/anstream/src/strip.rs
index 3b464445..3d3c6cd0 100644
--- a/crates/anstream/src/strip.rs
+++ b/crates/anstream/src/strip.rs
@@ -1,5 +1,4 @@
 use crate::adapter::StripBytes;
-use crate::IsTerminal;
 use crate::RawStream;
 
 /// Only pass printable data to the inner `Write`
@@ -67,16 +66,6 @@ impl StripStream<std::io::Stderr> {
     }
 }
 
-impl<S> IsTerminal for StripStream<S>
-where
-    S: RawStream,
-{
-    #[inline]
-    fn is_terminal(&self) -> bool {
-        self.is_terminal()
-    }
-}
-
 impl<S> std::io::Write for StripStream<S>
 where
     S: RawStream,
diff --git a/crates/anstream/src/wincon.rs b/crates/anstream/src/wincon.rs
index b9be2257..0e4f0d29 100644
--- a/crates/anstream/src/wincon.rs
+++ b/crates/anstream/src/wincon.rs
@@ -1,5 +1,4 @@
 use crate::adapter::WinconBytes;
-use crate::IsTerminal;
 use crate::RawStream;
 
 /// Only pass printable data to the inner `Write`
@@ -71,16 +70,6 @@ impl WinconStream<std::io::Stderr> {
     }
 }
 
-impl<S> IsTerminal for WinconStream<S>
-where
-    S: RawStream,
-{
-    #[inline]
-    fn is_terminal(&self) -> bool {
-        self.is_terminal()
-    }
-}
-
 impl<S> std::io::Write for WinconStream<S>
 where
     S: RawStream,