diff --git a/cli/js/lib.deno.ns.d.ts b/cli/js/lib.deno.ns.d.ts
index 4659c1ff73..edc9668e7d 100644
--- a/cli/js/lib.deno.ns.d.ts
+++ b/cli/js/lib.deno.ns.d.ts
@@ -791,7 +791,7 @@ declare namespace Deno {
     mode?: number;
   }
 
-  /** **UNSTABLE**: new API, yet to be vetted
+  /**
    *
    *  Check if a given resource id (`rid`) is a TTY.
    *
diff --git a/cli/ops/tty.rs b/cli/ops/tty.rs
index 447af9a2d5..cf7f62ed88 100644
--- a/cli/ops/tty.rs
+++ b/cli/ops/tty.rs
@@ -216,11 +216,10 @@ struct IsattyArgs {
 
 pub fn op_isatty(
   isolate: &mut CoreIsolate,
-  state: &State,
+  _state: &State,
   args: Value,
   _zero_copy: Option<ZeroCopyBuf>,
 ) -> Result<JsonOp, OpError> {
-  state.check_unstable("Deno.isatty");
   let args: IsattyArgs = serde_json::from_value(args)?;
   let rid = args.rid;