diff --git a/test/functional/mempool_updatefromblock.py b/test/functional/mempool_updatefromblock.py
index 16c15e3f74982..51de582ce0f11 100755
--- a/test/functional/mempool_updatefromblock.py
+++ b/test/functional/mempool_updatefromblock.py
@@ -17,7 +17,7 @@
 class MempoolUpdateFromBlockTest(BitcoinTestFramework):
     def set_test_params(self):
         self.num_nodes = 1
-        self.extra_args = [['-limitdescendantsize=1000', '-limitancestorsize=1000']]
+        self.extra_args = [['-limitdescendantsize=1000', '-limitancestorsize=1000', '-limitancestorcount=100']]
 
     def skip_test_if_missing_module(self):
         self.skip_if_no_wallet()