diff --git a/tests/edge/test_edge.py b/tests/edge/test_edge.py
index 4829dd035..53840b190 100644
--- a/tests/edge/test_edge.py
+++ b/tests/edge/test_edge.py
@@ -226,8 +226,10 @@ def test_edge_heartbeat_calculate(mocker, edge_conf):
     assert edge.calculate(edge_conf['exchange']['pair_whitelist']) is False
 
 
-def mocked_load_data(datadir, pairs=[], timeframe='0m',
+def mocked_load_data(datadir, pairs=None, timeframe='0m',
                      timerange=None, *args, **kwargs):
+    if pairs is None:
+        pairs = []
     hz = 0.1
     base = 0.001
 
diff --git a/tests/rpc/test_rpc_apiserver.py b/tests/rpc/test_rpc_apiserver.py
index 9e5c820c3..4024102fa 100644
--- a/tests/rpc/test_rpc_apiserver.py
+++ b/tests/rpc/test_rpc_apiserver.py
@@ -72,8 +72,10 @@ def botclient(default_conf, mocker):
         ApiServer.shutdown()
 
 
-def client_post(client: TestClient, url, data={}):
+def client_post(client: TestClient, url, data=None):
 
+    if data is None:
+        data = {}
     return client.post(url,
                        json=data,
                        headers={'Authorization': _basic_auth_str(_TEST_USER, _TEST_PASS),
@@ -82,8 +84,10 @@ def client_post(client: TestClient, url, data={}):
                                 })
 
 
-def client_patch(client: TestClient, url, data={}):
+def client_patch(client: TestClient, url, data=None):
 
+    if data is None:
+        data = {}
     return client.patch(url,
                         json=data,
                         headers={'Authorization': _basic_auth_str(_TEST_USER, _TEST_PASS),