diff --git a/kittengroomer/helpers.py b/kittengroomer/helpers.py
index 9ba2b5e..3e270dc 100644
--- a/kittengroomer/helpers.py
+++ b/kittengroomer/helpers.py
@@ -53,7 +53,10 @@ class FileBase(object):
 
     def _determine_extension(self):
         _, ext = os.path.splitext(self.src_path)
-        return ext.lower()
+        ext = ext.lower()
+        if ext == '':
+            ext = None
+        return ext
 
     def _determine_mimetype(self):
         if os.path.islink(self.src_path):
diff --git a/tests/test_kittengroomer.py b/tests/test_kittengroomer.py
index 8339e84..bb5ab5d 100644
--- a/tests/test_kittengroomer.py
+++ b/tests/test_kittengroomer.py
@@ -130,7 +130,6 @@ class TestFileBase:
     def test_has_extension(self, temp_file, temp_file_no_ext):
         assert temp_file.has_extension() is True
         assert temp_file_no_ext.has_extension() is False
-        assert temp_file_no_ext.log_details.get('no_extension') is True
 
     def test_add_log_details(self, generic_conf_file):
         generic_conf_file.add_log_details('test', True)