diff --git a/backend/src/api/mempool.ts b/backend/src/api/mempool.ts
index db5de82b2..1be1faceb 100644
--- a/backend/src/api/mempool.ts
+++ b/backend/src/api/mempool.ts
@@ -38,7 +38,6 @@ class Mempool {
 
   constructor() {
     setInterval(this.updateTxPerSecond.bind(this), 1000);
-    setInterval(this.deleteExpiredTransactions.bind(this), 20000);
   }
 
   /**
@@ -256,7 +255,7 @@ class Mempool {
     }
   }
 
-  private deleteExpiredTransactions() {
+  public deleteExpiredTransactions() {
     const now = new Date().getTime();
     for (const tx in this.mempoolCache) {
       const lazyDeleteAt = this.mempoolCache[tx].deleteAfter;
diff --git a/backend/src/index.ts b/backend/src/index.ts
index ccba83be9..a34ffd21b 100644
--- a/backend/src/index.ts
+++ b/backend/src/index.ts
@@ -178,6 +178,7 @@ class Server {
           logger.debug(msg);
         }
       }
+      memPool.deleteExpiredTransactions();
       await blocks.$updateBlocks();
       await memPool.$updateMempool();
       indexer.$run();