diff --git a/test/functional/blockchain.py b/test/functional/blockchain.py
--- a/test/functional/blockchain.py
+++ b/test/functional/blockchain.py
@@ -29,6 +29,8 @@
     assert_raises_jsonrpc,
     assert_is_hex_string,
     assert_is_hash_string,
+    start_node,
+    bitcoind_processes,
     BITCOIND_PROC_WAIT_TIMEOUT,
 )