diff --git a/test/test_utils.py b/test/test_utils.py
index 5ebb8d498..28bda654e 100644
--- a/test/test_utils.py
+++ b/test/test_utils.py
@@ -152,6 +152,17 @@ class TestUtil(unittest.TestCase):
         self.assertEqual(sanitize_path('\\\\?\\C:\\ab?c\\de:f'), '\\\\?\\C:\\ab#c\\de#f')
         self.assertEqual(sanitize_path('\\\\?\\C:\\abc'), '\\\\?\\C:\\abc')
 
+        self.assertEqual(
+            sanitize_path('youtube/%(uploader)s/%(autonumber)s-%(title)s-%(upload_date)s.%(ext)s'),
+            'youtube\\%(uploader)s\\%(autonumber)s-%(title)s-%(upload_date)s.%(ext)s')
+
+        self.assertEqual(
+            sanitize_path('youtube/TheWreckingYard ./00001-Not bad, Especially for Free! (1987 Yamaha 700)-20141116.mp4.part'),
+            'youtube\\TheWreckingYard #\\00001-Not bad, Especially for Free! (1987 Yamaha 700)-20141116.mp4.part')
+        self.assertEqual(sanitize_path('abc/def...'), 'abc\\def..#')
+        self.assertEqual(sanitize_path('abc.../def'), 'abc..#\\def')
+        self.assertEqual(sanitize_path('abc.../def...'), 'abc..#\\def..#')
+
     def test_ordered_set(self):
         self.assertEqual(orderedSet([1, 1, 2, 3, 4, 4, 5, 6, 7, 3, 5]), [1, 2, 3, 4, 5, 6, 7])
         self.assertEqual(orderedSet([]), [])
diff --git a/youtube_dl/utils.py b/youtube_dl/utils.py
index e511232ca..d5597d514 100644
--- a/youtube_dl/utils.py
+++ b/youtube_dl/utils.py
@@ -319,7 +319,7 @@ def sanitize_path(s):
     if unc_or_drive:
         norm_path.pop(0)
     sanitized_path = [
-        re.sub('[/<>:"\\|\\\\?\\*]', '#', path_part)
+        re.sub('(?:[/<>:"\\|\\\\?\\*]|\.$)', '#', path_part)
         for path_part in norm_path]
     if unc_or_drive:
         sanitized_path.insert(0, unc_or_drive + os.path.sep)