diff --git a/qa/rpc-tests/autoix-mempool.py b/qa/rpc-tests/autoix-mempool.py
index a8be9a321fc1a..1d5e6ff90eed6 100755
--- a/qa/rpc-tests/autoix-mempool.py
+++ b/qa/rpc-tests/autoix-mempool.py
@@ -161,8 +161,12 @@ def test_auto(self, new_is = False):
 
         # fill mempool with transactions
         self.set_autoix_spork_state(False)
+        self.nodes[0].spork("SPORK_2_INSTANTSEND_ENABLED", 4070908800)
+        self.wait_for_sporks_same()
         self.fill_mempool()
         self.set_autoix_spork_state(True)
+        self.nodes[0].spork("SPORK_2_INSTANTSEND_ENABLED", 0)
+        self.wait_for_sporks_same()
 
         # autoIX is not working now
         assert(not self.send_simple_tx(sender, receiver))