diff --git a/crates/oxc_ast/src/ast/ts.rs b/crates/oxc_ast/src/ast/ts.rs
index 87978d359..3738334f1 100644
--- a/crates/oxc_ast/src/ast/ts.rs
+++ b/crates/oxc_ast/src/ast/ts.rs
@@ -836,7 +836,7 @@ pub struct TSMappedType<'a> {
     pub span: Span,
     pub type_parameter: Box<'a, TSTypeParameter<'a>>,
     pub name_type: Option<TSType<'a>>,
-    pub type_annotation: Option<Box<'a, TSTypeAnnotation<'a>>>,
+    pub type_annotation: Option<TSType<'a>>,
     pub optional: TSMappedTypeModifierOperator,
     pub readonly: TSMappedTypeModifierOperator,
 }
diff --git a/crates/oxc_ast/src/ast_builder.rs b/crates/oxc_ast/src/ast_builder.rs
index 648ca6c5a..ea4ac4866 100644
--- a/crates/oxc_ast/src/ast_builder.rs
+++ b/crates/oxc_ast/src/ast_builder.rs
@@ -1667,7 +1667,7 @@ impl<'a> AstBuilder<'a> {
         span: Span,
         type_parameter: Box<'a, TSTypeParameter<'a>>,
         name_type: Option<TSType<'a>>,
-        type_annotation: Option<Box<'a, TSTypeAnnotation<'a>>>,
+        type_annotation: Option<TSType<'a>>,
         optional: TSMappedTypeModifierOperator,
         readonly: TSMappedTypeModifierOperator,
     ) -> TSType<'a> {
diff --git a/crates/oxc_ast/src/visit.rs b/crates/oxc_ast/src/visit.rs
index 9e3ead8fc..ccfae6845 100644
--- a/crates/oxc_ast/src/visit.rs
+++ b/crates/oxc_ast/src/visit.rs
@@ -1668,7 +1668,7 @@ pub trait Visit<'a>: Sized {
             self.visit_ts_type(name);
         }
         if let Some(type_annotation) = &ty.type_annotation {
-            self.visit_ts_type_annotation(type_annotation);
+            self.visit_ts_type(type_annotation);
         }
     }
 
diff --git a/crates/oxc_ast/src/visit_mut.rs b/crates/oxc_ast/src/visit_mut.rs
index af5555171..c1abda805 100644
--- a/crates/oxc_ast/src/visit_mut.rs
+++ b/crates/oxc_ast/src/visit_mut.rs
@@ -1667,7 +1667,7 @@ pub trait VisitMut<'a>: Sized {
             self.visit_ts_type(name);
         }
         if let Some(type_annotation) = &mut ty.type_annotation {
-            self.visit_ts_type_annotation(type_annotation);
+            self.visit_ts_type(type_annotation);
         }
     }
 
diff --git a/crates/oxc_parser/src/ts/types.rs b/crates/oxc_parser/src/ts/types.rs
index ad2bfd6fc..11866f08c 100644
--- a/crates/oxc_parser/src/ts/types.rs
+++ b/crates/oxc_parser/src/ts/types.rs
@@ -662,7 +662,7 @@ impl<'a> ParserImpl<'a> {
             _ => TSMappedTypeModifierOperator::None,
         };
 
-        let type_annotation = self.parse_ts_type_annotation()?;
+        let type_annotation = self.eat(Kind::Colon).then(|| self.parse_ts_type()).transpose()?;
         self.bump(Kind::Semicolon);
         self.expect(Kind::RCurly)?;