diff --git a/packages/compiler/src/output/output_ast.ts b/packages/compiler/src/output/output_ast.ts
index 7d1915f9b12..8c79fcd1ea2 100644
--- a/packages/compiler/src/output/output_ast.ts
+++ b/packages/compiler/src/output/output_ast.ts
@@ -988,7 +988,7 @@ export class LiteralArrayExpr extends Expression {
     return visitor.visitLiteralArrayExpr(this, context);
   }
 
-  clone(): LiteralArrayExpr {
+  override clone(): LiteralArrayExpr {
     return new LiteralArrayExpr(this.entries.map(e => e.clone()), this.type, this.sourceSpan);
   }
 }