diff --git a/crates/ruff_linter/src/checkers/ast/analyze/expression.rs b/crates/ruff_linter/src/checkers/ast/analyze/expression.rs
index 401d6a7abd85be..b46b4a01af9746 100644
--- a/crates/ruff_linter/src/checkers/ast/analyze/expression.rs
+++ b/crates/ruff_linter/src/checkers/ast/analyze/expression.rs
@@ -7,9 +7,7 @@ use ruff_python_semantic::analyze::typing;
 use ruff_text_size::Ranged;
 
 use crate::checkers::ast::Checker;
-use crate::preview::{
-    is_future_required_preview_generics_enabled, is_unnecessary_default_type_args_stubs_enabled,
-};
+use crate::preview::is_future_required_preview_generics_enabled;
 use crate::registry::Rule;
 use crate::rules::{
     airflow, flake8_2020, flake8_async, flake8_bandit, flake8_boolean_trap, flake8_bugbear,
@@ -145,8 +143,7 @@ pub(crate) fn expression(expr: &Expr, checker: &Checker) {
 
             if checker.is_rule_enabled(Rule::UnnecessaryDefaultTypeArgs) {
                 if checker.target_version() >= PythonVersion::PY313
-                    || is_unnecessary_default_type_args_stubs_enabled(checker.settings())
-                        && checker.semantic().in_stub_file()
+                    || checker.semantic().in_stub_file()
                 {
                     pyupgrade::rules::unnecessary_default_type_args(checker, expr);
                 }
diff --git a/crates/ruff_linter/src/preview.rs b/crates/ruff_linter/src/preview.rs
index cbc0d47b591903..9e0a3f3efb051c 100644
--- a/crates/ruff_linter/src/preview.rs
+++ b/crates/ruff_linter/src/preview.rs
@@ -201,13 +201,6 @@ pub(crate) const fn is_future_required_preview_generics_enabled(settings: &Linte
     settings.preview.is_enabled()
 }
 
-// https://github.com/astral-sh/ruff/pull/20027
-pub(crate) const fn is_unnecessary_default_type_args_stubs_enabled(
-    settings: &LinterSettings,
-) -> bool {
-    settings.preview.is_enabled()
-}
-
 // https://github.com/astral-sh/ruff/pull/20343
 pub(crate) const fn is_sim910_expanded_key_support_enabled(settings: &LinterSettings) -> bool {
     settings.preview.is_enabled()
diff --git a/crates/ruff_linter/src/rules/pyupgrade/mod.rs b/crates/ruff_linter/src/rules/pyupgrade/mod.rs
index 48012fdf693568..94495523083c02 100644
--- a/crates/ruff_linter/src/rules/pyupgrade/mod.rs
+++ b/crates/ruff_linter/src/rules/pyupgrade/mod.rs
@@ -439,12 +439,11 @@ mod tests {
     }
 
     #[test]
-    fn unnecessary_default_type_args_stubs_py312_preview() -> Result<()> {
-        let snapshot = format!("{}__preview", "UP043.pyi");
+    fn unnecessary_default_type_args_stubs_py312() -> Result<()> {
+        let snapshot = "UP043.pyi";
         let diagnostics = test_path(
             Path::new("pyupgrade/UP043.pyi"),
             &settings::LinterSettings {
-                preview: PreviewMode::Enabled,
                 unresolved_target_version: PythonVersion::PY312.into(),
                 ..settings::LinterSettings::for_rule(Rule::UnnecessaryDefaultTypeArgs)
             },
diff --git a/crates/ruff_linter/src/rules/pyupgrade/rules/unnecessary_default_type_args.rs b/crates/ruff_linter/src/rules/pyupgrade/rules/unnecessary_default_type_args.rs
index c61cee5cb861b4..3fcade60393517 100644
--- a/crates/ruff_linter/src/rules/pyupgrade/rules/unnecessary_default_type_args.rs
+++ b/crates/ruff_linter/src/rules/pyupgrade/rules/unnecessary_default_type_args.rs
@@ -8,7 +8,6 @@ use crate::{AlwaysFixableViolation, Applicability, Edit, Fix};
 /// ## What it does
 /// Checks for unnecessary default type arguments for `Generator` and
 /// `AsyncGenerator` on Python 3.13+.
-/// In [preview], this rule will also apply to stub files.
 ///
 /// ## Why is this bad?
 /// Python 3.13 introduced the ability for type parameters to specify default
@@ -60,8 +59,6 @@ use crate::{AlwaysFixableViolation, Applicability, Edit, Fix};
 /// - [Annotating generators and coroutines](https://docs.python.org/3/library/typing.html#annotating-generators-and-coroutines)
 /// - [Python documentation: `typing.Generator`](https://docs.python.org/3/library/typing.html#typing.Generator)
 /// - [Python documentation: `typing.AsyncGenerator`](https://docs.python.org/3/library/typing.html#typing.AsyncGenerator)
-///
-/// [preview]: https://docs.astral.sh/ruff/preview/
 #[derive(ViolationMetadata)]
 #[violation_metadata(stable_since = "0.8.0")]
 pub(crate) struct UnnecessaryDefaultTypeArgs;
diff --git a/crates/ruff_linter/src/rules/pyupgrade/snapshots/ruff_linter__rules__pyupgrade__tests__UP043.pyi__preview.snap b/crates/ruff_linter/src/rules/pyupgrade/snapshots/ruff_linter__rules__pyupgrade__tests__UP043.pyi.snap
similarity index 100%
rename from crates/ruff_linter/src/rules/pyupgrade/snapshots/ruff_linter__rules__pyupgrade__tests__UP043.pyi__preview.snap
rename to crates/ruff_linter/src/rules/pyupgrade/snapshots/ruff_linter__rules__pyupgrade__tests__UP043.pyi.snap