diff --git a/changelogs/unreleased/dz-scope-snippet-routes.yml b/changelogs/unreleased/dz-scope-snippet-routes.yml
new file mode 100644
index 0000000000000000000000000000000000000000..7e6fe32a19684bff56a9e494b7664475f43485a2
--- /dev/null
+++ b/changelogs/unreleased/dz-scope-snippet-routes.yml
@@ -0,0 +1,5 @@
+---
+title: Copy snippet route under - scope
+merge_request: 35020
+author:
+type: other
diff --git a/config/routes.rb b/config/routes.rb
index 598a52cddb350dedb0509a9bb7a28e9180b2e3b8..83db7ff8d4c57fc575814eda3b2fcf2eba598aab 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -262,6 +262,14 @@
   draw :user
   draw :project
 
+  # Serve snippet routes under /-/snippets.
+  # To ensure an old unscoped routing is used for the UI we need to
+  # add prefix 'as' to the scope routing and place it below original routing.
+  # Issue https://gitlab.com/gitlab-org/gitlab/-/issues/210024
+  scope '-', as: :scoped do
+    draw :snippets
+  end
+
   root to: "root#index"
 
   get '*unmatched_route', to: 'application#route_not_found'
diff --git a/spec/routing/routing_spec.rb b/spec/routing/routing_spec.rb
index 9c3d17f7d8fc724e20f171bcadcec4c29773b89d..982af3984f2f29b95a7ea1249025b78a9b252ae4 100644
--- a/spec/routing/routing_spec.rb
+++ b/spec/routing/routing_spec.rb
@@ -99,6 +99,10 @@
   it "to #destroy" do
     expect(delete("/snippets/1")).to route_to('snippets#destroy', id: '1')
   end
+
+  it 'to #show from scope routing' do
+    expect(get("/-/snippets/1")).to route_to('snippets#show', id: '1')
+  end
 end
 
 #            help GET /help(.:format)                 help#index