diff --git a/berserk/models.py b/berserk/models.py
index 59c4c27..45f3f7f 100644
--- a/berserk/models.py
+++ b/berserk/models.py
@@ -68,8 +68,8 @@ class Game(Model):
 
 class GameState(Model):
     createdAt = utils.datetime_from_millis
-    wtime = utils.timedelta_from_milis
-    btime = utils.timedelta_from_milis
+    wtime = utils.timedelta_from_millis
+    btime = utils.timedelta_from_millis
     winc = utils.datetime_from_millis
     binc = utils.datetime_from_millis
 
diff --git a/berserk/utils.py b/berserk/utils.py
index 7b6373c..5a36430 100644
--- a/berserk/utils.py
+++ b/berserk/utils.py
@@ -20,6 +20,8 @@ def timedelta_from_millis(millis: float) -> timedelta:
     for a given milliseconds.
     """
     return timedelta(milliseconds=millis)
+
+
 def datetime_from_seconds(ts: float) -> datetime:
     """Return the datetime for the given seconds since the epoch.
 
diff --git a/tests/test_models.py b/tests/test_models.py
index 50bbc94..b8122cc 100644
--- a/tests/test_models.py
+++ b/tests/test_models.py
@@ -1,4 +1,4 @@
-from berserk import models
+from berserk import models, utils
 
 
 def test_conversion():
@@ -9,17 +9,16 @@ class Example(models.Model):
     modified = {"foo": 5, "bar": 3, "baz": "4"}
     assert Example.convert(original) == modified
 
+
 def test_time_delta():
     """test timedelta_from millis"""
     test_data = 1000.0
-    dt1 = datetime_from_millis(test_data)
-    dt2 = datetime_from_millis(2 * test_data)
+    dt1 = utils.datetime_from_millis(test_data)
+    dt2 = utils.datetime_from_millis(2 * test_data)
 
-    delta_1 = timedelta_from_millis(test_data)
+    delta_1 = utils.timedelta_from_millis(test_data)
 
     # time delta dt1 dt2
     delta_2 = dt2 - dt1
 
     assert delta_1 == delta_2
-
-