diff --git a/torba/orchstr8/node.py b/torba/orchstr8/node.py
index c6309e905..1918a1b01 100644
--- a/torba/orchstr8/node.py
+++ b/torba/orchstr8/node.py
@@ -177,7 +177,7 @@ class SPVNode:
         }
         os.environ.update(conf)
         self.server = Server(Env(self.coin_class))
-        self.server.bp.prefetcher.polling_delay = 0.5
+        self.server.mempool.refresh_secs = self.server.bp.prefetcher.polling_delay = 0.5
         await self.server.start()
 
     async def stop(self, cleanup=True):