diff --git a/minode/tests/test_app.py b/minode/tests/test_app.py
index 4eccd60..7ef63c9 100644
--- a/minode/tests/test_app.py
+++ b/minode/tests/test_app.py
@@ -34,7 +34,8 @@ class TestAppProto(unittest.TestCase):
 
     def _connections(self):
         return [
-            c for c in shared.connections if c.status == 'fully_established']
+            c for c in shared.connections.copy()
+            if c.status == 'fully_established']
 
     @classmethod
     def setUpClass(cls):