diff --git a/packages/svelte/src/compiler/types/template.d.ts b/packages/svelte/src/compiler/types/template.d.ts
index 6dec1f2dbe..b51c9e9a8d 100644
--- a/packages/svelte/src/compiler/types/template.d.ts
+++ b/packages/svelte/src/compiler/types/template.d.ts
@@ -547,7 +547,13 @@ export namespace AST {
 		| AST.SvelteWindow
 		| AST.SvelteBoundary;
 
-	export type Tag = AST.ExpressionTag | AST.HtmlTag | AST.ConstTag | AST.DebugTag | AST.RenderTag;
+	export type Tag =
+		| AST.AttachTag
+		| AST.ConstTag
+		| AST.DebugTag
+		| AST.ExpressionTag
+		| AST.HtmlTag
+		| AST.RenderTag;
 
 	export type TemplateNode =
 		| AST.Root