diff --git a/v1/index.d.ts b/v1/index.d.ts
index e1059d2..e37a1e8 100644
--- a/v1/index.d.ts
+++ b/v1/index.d.ts
@@ -2,6 +2,8 @@
  * CloudEvent class definition
  */
 export class Cloudevent {
+  public constructor();
+
   public format(): any;
   public toString(): string;