diff --git a/Cargo.lock b/Cargo.lock
index b1f2fab8..1403b5d6 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -42,7 +42,6 @@ dependencies = [
  "anstyle-wincon 2.0.0",
  "colorchoice 1.0.0",
  "criterion",
- "is-terminal",
  "owo-colors",
  "proptest",
  "strip-ansi-escapes",
diff --git a/crates/anstream/Cargo.toml b/crates/anstream/Cargo.toml
index 5afb595b..f4522619 100644
--- a/crates/anstream/Cargo.toml
+++ b/crates/anstream/Cargo.toml
@@ -26,7 +26,7 @@ pre-release-replacements = [
 
 [features]
 default = ["auto", "wincon"]
-auto = ["dep:anstyle-query", "dep:colorchoice", "dep:is-terminal"]
+auto = ["dep:anstyle-query", "dep:colorchoice"]
 wincon = ["dep:anstyle-wincon"]
 
 [dependencies]
@@ -34,7 +34,6 @@ anstyle = { version = "1.0.0", path = "../anstyle" }
 anstyle-parse = { version = "0.2.0", path = "../anstyle-parse" }
 colorchoice = { version = "1.0.0", path = "../colorchoice", optional = true }
 anstyle-query = { version = "1.0.0", path = "../anstyle-query", optional = true }
-is-terminal = { version = "0.4.4", optional = true }
 utf8parse = "0.2.1"
 
 [target.'cfg(windows)'.dependencies]
diff --git a/crates/anstream/src/auto.rs b/crates/anstream/src/auto.rs
index de1b822a..969a8da9 100644
--- a/crates/anstream/src/auto.rs
+++ b/crates/anstream/src/auto.rs
@@ -1,5 +1,6 @@
 #[cfg(feature = "auto")]
 use crate::ColorChoice;
+use crate::IsTerminal;
 use crate::Lockable;
 use crate::RawStream;
 use crate::StripStream;
@@ -161,7 +162,7 @@ fn choice(raw: &dyn RawStream) -> ColorChoice {
 }
 
 #[cfg(feature = "auto")]
-impl<S> is_terminal::IsTerminal for AutoStream<S>
+impl<S> IsTerminal for AutoStream<S>
 where
     S: RawStream,
 {
diff --git a/crates/anstream/src/buffer.rs b/crates/anstream/src/buffer.rs
index 1ba0bffd..e635687c 100644
--- a/crates/anstream/src/buffer.rs
+++ b/crates/anstream/src/buffer.rs
@@ -1,3 +1,5 @@
+use crate::IsTerminal;
+
 /// In-memory [`RawStream`][crate::RawStream]
 #[derive(Clone, Default, Debug, PartialEq, Eq)]
 pub struct Buffer(Vec<u8>);
@@ -26,8 +28,7 @@ impl AsRef<[u8]> for Buffer {
     }
 }
 
-#[cfg(feature = "auto")]
-impl is_terminal::IsTerminal for Buffer {
+impl IsTerminal for Buffer {
     #[inline]
     fn is_terminal(&self) -> bool {
         false
diff --git a/crates/anstream/src/is_terminal.rs b/crates/anstream/src/is_terminal.rs
new file mode 100644
index 00000000..840f851d
--- /dev/null
+++ b/crates/anstream/src/is_terminal.rs
@@ -0,0 +1,70 @@
+pub trait IsTerminal {
+    fn is_terminal(&self) -> bool;
+}
+
+impl IsTerminal for std::io::Stdout {
+    #[inline]
+    fn is_terminal(&self) -> bool {
+        std::io::IsTerminal::is_terminal(self)
+    }
+}
+
+impl IsTerminal for std::io::StdoutLock<'static> {
+    #[inline]
+    fn is_terminal(&self) -> bool {
+        std::io::IsTerminal::is_terminal(self)
+    }
+}
+
+impl IsTerminal for std::io::Stderr {
+    #[inline]
+    fn is_terminal(&self) -> bool {
+        std::io::IsTerminal::is_terminal(self)
+    }
+}
+
+impl IsTerminal for std::io::StderrLock<'static> {
+    #[inline]
+    fn is_terminal(&self) -> bool {
+        std::io::IsTerminal::is_terminal(self)
+    }
+}
+
+#[cfg(all(windows, feature = "wincon"))]
+impl IsTerminal for anstyle_wincon::Console<std::io::Stdout> {
+    #[inline]
+    fn is_terminal(&self) -> bool {
+        self.is_terminal()
+    }
+}
+
+#[cfg(all(windows, feature = "wincon"))]
+impl IsTerminal for anstyle_wincon::Console<std::io::StdoutLock<'static>> {
+    #[inline]
+    fn is_terminal(&self) -> bool {
+        self.is_terminal()
+    }
+}
+
+#[cfg(all(windows, feature = "wincon"))]
+impl IsTerminal for anstyle_wincon::Console<std::io::Stderr> {
+    #[inline]
+    fn is_terminal(&self) -> bool {
+        self.is_terminal()
+    }
+}
+
+#[cfg(all(windows, feature = "wincon"))]
+impl IsTerminal for anstyle_wincon::Console<std::io::StderrLock<'static>> {
+    #[inline]
+    fn is_terminal(&self) -> bool {
+        self.is_terminal()
+    }
+}
+
+impl IsTerminal for std::fs::File {
+    #[inline]
+    fn is_terminal(&self) -> bool {
+        std::io::IsTerminal::is_terminal(self)
+    }
+}
diff --git a/crates/anstream/src/lib.rs b/crates/anstream/src/lib.rs
index 582fa522..1799c16b 100644
--- a/crates/anstream/src/lib.rs
+++ b/crates/anstream/src/lib.rs
@@ -39,6 +39,7 @@ mod buffer;
 #[macro_use]
 mod macros;
 mod auto;
+mod is_terminal;
 mod lockable;
 mod raw;
 mod strip;
@@ -46,6 +47,7 @@ mod strip;
 mod wincon;
 
 pub use auto::AutoStream;
+pub use is_terminal::IsTerminal;
 pub use lockable::Lockable;
 pub use raw::RawStream;
 pub use strip::StripStream;
diff --git a/crates/anstream/src/raw.rs b/crates/anstream/src/raw.rs
index ecf7c685..4a54b400 100644
--- a/crates/anstream/src/raw.rs
+++ b/crates/anstream/src/raw.rs
@@ -1,19 +1,13 @@
-/// Required functionality for underlying [`std::io::Write`] for adaptation
-#[cfg(not(any(feature = "auto", all(windows, feature = "wincon"))))]
-pub trait RawStream: std::io::Write + private::Sealed {}
-
-/// Required functionality for underlying [`std::io::Write`] for adaptation
-#[cfg(all(feature = "auto", not(all(windows, feature = "wincon"))))]
-pub trait RawStream: std::io::Write + is_terminal::IsTerminal + private::Sealed {}
+use crate::IsTerminal;
 
 /// Required functionality for underlying [`std::io::Write`] for adaptation
-#[cfg(all(not(feature = "auto"), all(windows, feature = "wincon")))]
-pub trait RawStream: std::io::Write + anstyle_wincon::WinconStream + private::Sealed {}
+#[cfg(not(all(windows, feature = "wincon")))]
+pub trait RawStream: std::io::Write + IsTerminal + private::Sealed {}
 
 /// Required functionality for underlying [`std::io::Write`] for adaptation
-#[cfg(all(feature = "auto", all(windows, feature = "wincon")))]
+#[cfg(all(windows, feature = "wincon"))]
 pub trait RawStream:
-    std::io::Write + is_terminal::IsTerminal + anstyle_wincon::WinconStream + private::Sealed
+    std::io::Write + IsTerminal + anstyle_wincon::WinconStream + private::Sealed
 {
 }
 
diff --git a/crates/anstream/src/strip.rs b/crates/anstream/src/strip.rs
index 0dd01749..a5b80987 100644
--- a/crates/anstream/src/strip.rs
+++ b/crates/anstream/src/strip.rs
@@ -1,4 +1,5 @@
 use crate::adapter::StripBytes;
+use crate::IsTerminal;
 use crate::Lockable;
 use crate::RawStream;
 
@@ -29,14 +30,12 @@ where
     }
 
     #[inline]
-    #[cfg(feature = "auto")]
     pub fn is_terminal(&self) -> bool {
         self.raw.is_terminal()
     }
 }
 
-#[cfg(feature = "auto")]
-impl<S> is_terminal::IsTerminal for StripStream<S>
+impl<S> IsTerminal for StripStream<S>
 where
     S: RawStream,
 {
diff --git a/crates/anstream/src/wincon.rs b/crates/anstream/src/wincon.rs
index e29b974d..8983db86 100644
--- a/crates/anstream/src/wincon.rs
+++ b/crates/anstream/src/wincon.rs
@@ -1,4 +1,5 @@
 use crate::adapter::WinconBytes;
+use crate::IsTerminal;
 use crate::Lockable;
 use crate::RawStream;
 
@@ -36,7 +37,6 @@ where
     }
 
     #[inline]
-    #[cfg(feature = "auto")]
     pub fn is_terminal(&self) -> bool {
         // HACK: We can't get the console's stream to check but if there is a console, it likely is
         // a terminal
@@ -44,8 +44,7 @@ where
     }
 }
 
-#[cfg(feature = "auto")]
-impl<S> is_terminal::IsTerminal for WinconStream<S>
+impl<S> IsTerminal for WinconStream<S>
 where
     S: RawStream,
 {