diff --git a/packages/typescript-estree/src/ts-estree/ts-estree.ts b/packages/typescript-estree/src/ts-estree/ts-estree.ts
index 504280e4850..e786e83e0df 100644
--- a/packages/typescript-estree/src/ts-estree/ts-estree.ts
+++ b/packages/typescript-estree/src/ts-estree/ts-estree.ts
@@ -659,7 +659,7 @@ export interface ExportAllDeclaration extends BaseNode {
 
 export interface ExportDefaultDeclaration extends BaseNode {
   type: AST_NODE_TYPES.ExportDefaultDeclaration;
-  declaration: ExportDeclaration;
+  declaration: ExportDeclaration | Expression;
 }
 
 export interface ExportNamedDeclaration extends BaseNode {