diff --git a/databricks/koalas/series.py b/databricks/koalas/series.py
index f6e011830d..64c3b0aa54 100644
--- a/databricks/koalas/series.py
+++ b/databricks/koalas/series.py
@@ -1478,7 +1478,11 @@ def to_list(self):
             to be small, as all the data is loaded into the driver's memory.
 
         """
-        return self._to_internal_pandas().to_list()
+        # pandas<0.24 doesn't support `to_list()` as an alias for `tolist()`
+        if LooseVersion(pd.__version__) < LooseVersion("0.24"):
+            return self._to_internal_pandas().tolist()
+        else:
+            return self._to_internal_pandas().to_list()
 
     tolist = to_list
 
diff --git a/databricks/koalas/tests/test_series.py b/databricks/koalas/tests/test_series.py
index 9aa29f59d6..56248e56db 100644
--- a/databricks/koalas/tests/test_series.py
+++ b/databricks/koalas/tests/test_series.py
@@ -861,7 +861,9 @@ def test_is_unique(self):
 
     def test_to_list(self):
         if LooseVersion(pd.__version__) >= LooseVersion("0.24.0"):
-            self.assertEqual(self.kser.to_list(), self.pser.to_list())
+            self.assert_eq(self.kser.to_list(), self.pser.to_list())
+        else:
+            self.assert_eq(self.kser.tolist(), self.pser.tolist())
 
     def test_append(self):
         pser1 = pd.Series([1, 2, 3], name="0")