diff --git a/gallery/models.py b/gallery/models.py
index 24293d4..8e47cd1 100644
--- a/gallery/models.py
+++ b/gallery/models.py
@@ -65,14 +65,11 @@ class Photo(models.Model):
     def _get_upload_path(instance, filename):
         return os.path.join('albums', str(instance.album.slug), filename)
 
-    def _generate_unique_slug(self, datetime_taken=None):
-        datetime_taken = datetime_taken or datetime.now()
-        slug = datetime_taken.strftime('%y%m%d%H%M%S')
-        counter = 0
+    def _generate_unique_slug(self, datetime_taken=datetime.now()):
+        slug = int(datetime_taken.strftime('%y%m%d%H%M%S'))
         while Photo.objects.filter(album=self.album, slug=slug).exists():
-            counter += 1
-            slug = (datetime_taken + timedelta(seconds=counter)).strftime('%y%m%d%H%M%S')
-        return slug
+            slug += 1
+        return str(slug)
 
     album = models.ForeignKey(Album, on_delete=models.CASCADE, related_name='photos', verbose_name="Album")
     slug = models.CharField(max_length=15, editable=False, verbose_name="Photo Slug")