diff --git a/pandas/tests/indexes/interval/test_formats.py b/pandas/tests/indexes/interval/test_formats.py
index db477003900bc5..5e93ba50467bf0 100644
--- a/pandas/tests/indexes/interval/test_formats.py
+++ b/pandas/tests/indexes/interval/test_formats.py
@@ -30,7 +30,7 @@ def test_frame_repr(self):
                 Series,
                 (
                     "(0.0, 1.0]    a\n"
-                    "NaN           b\n"
+                    "None          b\n"
                     "(2.0, 3.0]    c\n"
                     "dtype: object"
                 ),
diff --git a/pandas/tests/io/formats/test_format.py b/pandas/tests/io/formats/test_format.py
index 801bb1845e01e0..762ddae16d597f 100644
--- a/pandas/tests/io/formats/test_format.py
+++ b/pandas/tests/io/formats/test_format.py
@@ -2260,7 +2260,7 @@ def test_east_asian_unicode_series(self):
         # object dtype, shorter than unicode repr
         s = Series([1, 22, 3333, 44444], index=[1, "AB", np.nan, "あああ"])
         expected = (
-            "1          1\nAB        22\nNaN     3333\nあああ    44444\ndtype: int64"
+            "1          1\nAB        22\nnan     3333\nあああ    44444\ndtype: int64"
         )
         assert repr(s) == expected
 
@@ -2356,7 +2356,7 @@ def test_east_asian_unicode_series(self):
             # object dtype, shorter than unicode repr
             s = Series([1, 22, 3333, 44444], index=[1, "AB", np.nan, "あああ"])
             expected = (
-                "1             1\nAB           22\nNaN        3333\n"
+                "1             1\nAB           22\nnan        3333\n"
                 "あああ    44444\ndtype: int64"
             )
             assert repr(s) == expected