diff --git a/test/functional/bip68-sequence.py b/test/functional/bip68-sequence.py
--- a/test/functional/bip68-sequence.py
+++ b/test/functional/bip68-sequence.py
@@ -435,11 +435,13 @@
         assert_greater_than(csv_activation_height - height, 1)
         self.nodes[0].generate(csv_activation_height - height - 1)
         assert_equal(self.get_csv_status(), False)
+        disconnect_nodes(self.nodes[0], 1)
         self.nodes[0].generate(1)
         assert_equal(self.get_csv_status(), True)
         # We have a block that has CSV activated, but we want to be at
         # the activation point, so we invalidate the tip.
         self.nodes[0].invalidateblock(self.nodes[0].getbestblockhash())
+        connect_nodes(self.nodes[0], 1)
         sync_blocks(self.nodes)
 
     # Use self.nodes[1] to test standardness relay policy