diff --git a/crates/oxc_span/src/span/types.rs b/crates/oxc_span/src/span/types.rs
index 278b7e58a517b..1a62df8a6bc75 100644
--- a/crates/oxc_span/src/span/types.rs
+++ b/crates/oxc_span/src/span/types.rs
@@ -61,7 +61,7 @@ use super::PointerAlign;
 #[ast(visit)]
 #[derive(Default, Clone, Copy, Eq, PartialOrd, Ord)]
 #[generate_derive(ESTree)]
-#[estree(no_type, always_flatten)]
+#[estree(no_type, flatten)]
 pub struct Span {
     /// The zero-based start offset of the span
     pub start: u32,
diff --git a/tasks/ast_tools/src/derives/estree.rs b/tasks/ast_tools/src/derives/estree.rs
index a25c7334fe858..89ca84914849b 100644
--- a/tasks/ast_tools/src/derives/estree.rs
+++ b/tasks/ast_tools/src/derives/estree.rs
@@ -84,7 +84,7 @@ fn parse_estree_attr(location: AttrLocation, part: AttrPart) -> Result<()> {
     match location {
         // `#[estree]` attr on struct
         AttrLocation::Struct(struct_def) => match part {
-            AttrPart::Tag("always_flatten") => struct_def.estree.always_flatten = true,
+            AttrPart::Tag("flatten") => struct_def.estree.flatten = true,
             AttrPart::Tag("no_type") => struct_def.estree.no_type = true,
             AttrPart::Tag("custom_serialize") => struct_def.estree.custom_serialize = true,
             AttrPart::String("rename", value) => struct_def.estree.rename = Some(value),
@@ -266,7 +266,7 @@ pub fn should_add_type_field_to_struct(struct_def: &StructDef) -> bool {
 /// Get if should flatten a struct field.
 ///
 /// Returns `true` if either the field has an `#[estree(flatten)]` attr on it,
-/// or the type that the field contains has an `#[estree(always_flatten)]` attr.
+/// or the type that the field contains has an `#[estree(flatten)]` attr.
 ///
 /// This function also used by Typescript generator.
 pub fn should_flatten_field(field: &FieldDef, schema: &Schema) -> bool {
@@ -274,7 +274,7 @@ pub fn should_flatten_field(field: &FieldDef, schema: &Schema) -> bool {
         true
     } else {
         let field_type = field.type_def(schema);
-        matches!(field_type, TypeDef::Struct(field_struct_def) if field_struct_def.estree.always_flatten)
+        matches!(field_type, TypeDef::Struct(field_struct_def) if field_struct_def.estree.flatten)
     }
 }
 
diff --git a/tasks/ast_tools/src/schema/extensions/estree.rs b/tasks/ast_tools/src/schema/extensions/estree.rs
index 199d1c69ee308..ea681e424df2a 100644
--- a/tasks/ast_tools/src/schema/extensions/estree.rs
+++ b/tasks/ast_tools/src/schema/extensions/estree.rs
@@ -4,7 +4,7 @@ pub struct ESTreeStruct {
     pub rename: Option<String>,
     pub via: Option<String>,
     pub add_ts: Option<String>,
-    pub always_flatten: bool,
+    pub flatten: bool,
     pub no_type: bool,
     pub custom_serialize: bool,
 }