diff --git a/test/functional/test_framework/util.py b/test/functional/test_framework/util.py
index 664dc6d0a..62c4e46af 100644
--- a/test/functional/test_framework/util.py
+++ b/test/functional/test_framework/util.py
@@ -292,6 +292,7 @@ def initialize_datadir(dirname, n):
         f.write("port=" + str(p2p_port(n)) + "\n")
         f.write("rpcport=" + str(rpc_port(n)) + "\n")
         f.write("listenonion=0\n")
+        f.write("bind=127.0.0.1\n")
     return datadir
 
 def get_datadir_path(dirname, n):