diff --git a/tests/fixtures.py b/tests/fixtures.py
index 87b24b898..97db46e6e 100644
--- a/tests/fixtures.py
+++ b/tests/fixtures.py
@@ -189,7 +189,8 @@ def mining_ursulas(three_agents):
     _ursulas = make_ursulas(ursula_starting_port=starting_point,
                             ether_addresses=ursula_addresses,
                             miner_agent=miner_agent,
-                            miners=True)
+                            miners=True,
+                            ursula_starting_port=starting_point)
     try:
         yield _ursulas
     finally: