diff --git a/mutapath/immutapath.py b/mutapath/immutapath.py
index 29783a7..e26080c 100644
--- a/mutapath/immutapath.py
+++ b/mutapath/immutapath.py
@@ -23,6 +23,8 @@
     from mashumaro.types import SerializableType
 except ImportError:
     SerializableType = object
+except NotImplementedError:
+    SerializableType = object
 
 POSIX_ENABLED_DEFAULT = False
 
diff --git a/tests/serializable.py b/tests/serializable.py
deleted file mode 100644
index 7cab268..0000000
--- a/tests/serializable.py
+++ /dev/null
@@ -1,39 +0,0 @@
-from dataclasses import dataclass
-
-from mashumaro import DataClassDictMixin
-
-from mutapath import Path
-from tests.helper import PathTest
-
-
-@dataclass
-class DataClass(DataClassDictMixin):
-    path: Path = Path()
-
-
-class TestSerialization(PathTest):
-
-    def test_empty_serialization(self):
-        expected = {'path': ''}
-        actual = DataClass().to_dict()
-        self.assertEqual(expected, actual)
-
-    def test_serialization(self):
-        expected = {'path': "/A/B/test1.txt"}
-        actual = DataClass(Path("/A/B/test1.txt", posix=True)).to_dict()
-        self.assertEqual(expected, actual)
-
-    def test_empty_deserialization(self):
-        expected = DataClass()
-        actual = DataClass().from_dict({'path': ''})
-        self.assertEqual(expected, actual)
-
-    def test_deserialization(self):
-        expected = DataClass(Path("/A/B/test1.txt", posix=True))
-        actual = DataClass().from_dict({'path': "/A/B/test1.txt"})
-        self.assertEqual(expected, actual)
-
-    def test_deserialization_static(self):
-        expected = DataClass(Path("/A/B/test1.txt", posix=True))
-        actual = DataClass.from_dict({'path': "/A/B/test1.txt"})
-        self.assertEqual(expected, actual)
diff --git a/tests/test_serializable.py b/tests/test_serializable.py
new file mode 100644
index 0000000..261bae1
--- /dev/null
+++ b/tests/test_serializable.py
@@ -0,0 +1,45 @@
+from dataclasses import dataclass
+
+from mashumaro import DataClassDictMixin
+
+from mutapath import Path
+from tests.helper import PathTest
+
+try:
+    from mashumaro.types import SerializableType
+except ImportError:
+    SerializableType = object
+except NotImplementedError:
+    SerializableType = object
+else:
+
+    @dataclass
+    class DataClass(DataClassDictMixin):
+        path: Path = Path()
+
+
+    class TestSerialization(PathTest):
+        def test_empty_serialization(self):
+            expected = {'path': ''}
+            actual = DataClass().to_dict()
+            self.assertEqual(expected, actual)
+
+        def test_serialization(self):
+            expected = {'path': "/A/B/test1.txt"}
+            actual = DataClass(Path("/A/B/test1.txt", posix=True)).to_dict()
+            self.assertEqual(expected, actual)
+
+        def test_empty_deserialization(self):
+            expected = DataClass()
+            actual = DataClass().from_dict({'path': ''})
+            self.assertEqual(expected, actual)
+
+        def test_deserialization(self):
+            expected = DataClass(Path("/A/B/test1.txt", posix=True))
+            actual = DataClass().from_dict({'path': "/A/B/test1.txt"})
+            self.assertEqual(expected, actual)
+
+        def test_deserialization_static(self):
+            expected = DataClass(Path("/A/B/test1.txt", posix=True))
+            actual = DataClass.from_dict({'path': "/A/B/test1.txt"})
+            self.assertEqual(expected, actual)