diff --git a/pynames/tests/test_utils.py b/pynames/tests/test_utils.py
new file mode 100644
index 0000000..fc58a2c
--- /dev/null
+++ b/pynames/tests/test_utils.py
@@ -0,0 +1,29 @@
+# coding: utf-8
+
+import unittest
+import tempfile
+
+from pynames.utils import is_file
+
+try:
+    from django.core.files import File
+    from django.core.files.base import ContentFile
+    from django.core.files.uploadedfile import UploadedFile
+except:
+    UploadedFile = None
+    File = None
+    ContentFile = None
+
+
+class TestName(unittest.TestCase):
+
+    def test_is_file(self):
+        some_file = tempfile.NamedTemporaryFile()
+        self.assertTrue(is_file(some_file))
+        some_file.close()
+
+    def test_is_file_on_django_files(self):
+        if File and UploadedFile and ContentFile:
+            self.assertTrue(is_file(UploadedFile('mock')))
+            self.assertTrue(is_file(File('mock')))
+            self.assertTrue(is_file(ContentFile('mock')))
diff --git a/pynames/utils.py b/pynames/utils.py
index c8f4f81..a0e1c0b 100644
--- a/pynames/utils.py
+++ b/pynames/utils.py
@@ -49,4 +49,8 @@ def is_file(obj):
     Suitable to check both builtin ``file`` and ``django.core.file.File`` instances.
 
     """
-    return all([callable(getattr(obj, method_name, None)) for method_name in ('next', '__enter__', '__exit__')])
+    return all(
+        [callable(getattr(obj, method_name, None)) for method_name in ('__enter__', '__exit__')]
+        +
+        [any([callable(getattr(obj, method_name, None)) for method_name in ('next', '__iter__')])]
+    )