diff --git a/addons/website_slides/models/slide_channel.py b/addons/website_slides/models/slide_channel.py
index 47a823b6702..214a2025f2c 100644
--- a/addons/website_slides/models/slide_channel.py
+++ b/addons/website_slides/models/slide_channel.py
@@ -621,13 +621,13 @@ class Channel(models.Model):
             })
         return category_data
 
-    def _resequence_slides(self, slide):
+    def _resequence_slides(self, slide, force_category=False):
         ids_to_resequence = self.slide_ids.ids
         index_of_added_slide = ids_to_resequence.index(slide.id)
-        category_id = slide.category_id.id
         next_category_id = None
         if self.slide_category_ids:
-            index_of_category = self.slide_category_ids.ids.index(category_id) if category_id else None
+            force_category_id = force_category.id if force_category else slide.category_id.id
+            index_of_category = self.slide_category_ids.ids.index(force_category_id) if force_category_id else None
             if index_of_category is None:
                 next_category_id = self.slide_category_ids.ids[0]
             elif index_of_category < len(self.slide_category_ids.ids) - 1:
@@ -638,7 +638,7 @@ class Channel(models.Model):
             index_of_next_category = ids_to_resequence.index(next_category_id)
             ids_to_resequence.insert(index_of_next_category, added_slide_id)
             for i, record in enumerate(self.env['slide.slide'].browse(ids_to_resequence)):
-                record.write({'sequence': i})
+                record.write({'sequence': i + 1})  # start at 1 to make people scream
         else:
             slide.write({
                 'sequence': self.env['slide.slide'].browse(ids_to_resequence[-1]).sequence + 1
diff --git a/addons/website_slides/tests/test_slide_utils.py b/addons/website_slides/tests/test_slide_utils.py
index 158d59e94a3..489f2de0d0f 100644
--- a/addons/website_slides/tests/test_slide_utils.py
+++ b/addons/website_slides/tests/test_slide_utils.py
@@ -55,20 +55,32 @@ class TestSequencing(slides_common.SlidesCase):
 
     @users('user_officer')
     def test_resequence(self):
+        self.assertEqual(self.slide.sequence, 1)
         self.category.write({'sequence': 4})
         self.slide_2.write({'sequence': 8})
         self.slide_3.write({'sequence': 3})
 
         self.channel.invalidate_cache()
         self.assertEqual([s.id for s in self.channel.slide_ids], [self.slide.id, self.slide_3.id, self.category.id, self.slide_2.id])
-
         self.assertEqual(self.slide.sequence, 1)
-        # self.channel._resequence_slides(self.slide)
-        # self.channel.invalidate_cache()
-        # # self.assertEqual([s.id for s in self.channel.slide_ids], [self.slide.id, self.slide_3.id, self.category.id, self.slide_2.id])
-        # self.assertEqual(self.slide_3.sequence, 2)
-        # self.assertEqual(self.category.sequence, 3)
-        # self.assertEqual(self.slide_2.sequence, 4)
+
+        # insert a new category and check resequence_slides does as expected
+        new_category = self.env['slide.slide'].create({
+            'name': 'Sub-cooking Tips Category',
+            'channel_id': self.channel.id,
+            'is_category': True,
+            'is_published': True,
+            'sequence': 2,
+        })
+        new_category.flush()
+        self.channel.invalidate_cache()
+        self.channel._resequence_slides(self.slide_3, force_category=new_category)
+        self.assertEqual(self.slide.sequence, 1)
+        self.assertEqual(new_category.sequence, 2)
+        self.assertEqual(self.slide_3.sequence, 3)
+        self.assertEqual(self.category.sequence, 4)
+        self.assertEqual(self.slide_2.sequence, 5)
+        self.assertEqual([s.id for s in self.channel.slide_ids], [self.slide.id, new_category.id, self.slide_3.id, self.category.id, self.slide_2.id])
 
 
 class TestFromURL(slides_common.SlidesCase):