1 files changed, 1 insertions, 0 deletions
diff --git a/packages/0x.js/src/order_watcher/expiration_watcher.ts b/packages/0x.js/src/order_watcher/expiration_watcher.ts
index f9c6571db..0f73d088a 100644
--- a/packages/0x.js/src/order_watcher/expiration_watcher.ts
+++ b/packages/0x.js/src/order_watcher/expiration_watcher.ts
@@ -40,6 +40,7 @@ export class ExpirationWatcher {
         }
         intervalUtils.clearAsyncExcludingInterval(this.orderExpirationCheckingIntervalIdIfExists);
         delete this.callbackIfExists;
+        delete this.orderExpirationCheckingIntervalIdIfExists;
     }
     public addOrder(orderHash: string, expirationUnixTimestampSec: BigNumber): void {
         this.expiration[orderHash] = expirationUnixTimestampSec;