diff --git a/changelogs/unreleased/deprecated-positional-seperator-parameter.yml b/changelogs/unreleased/deprecated-positional-seperator-parameter.yml
new file mode 100644
index 00000000000..0d952e0d5eb
--- /dev/null
+++ b/changelogs/unreleased/deprecated-positional-seperator-parameter.yml
@@ -0,0 +1,5 @@
+---
+title: Passing the separator argument as a positional parameter is deprecated
+merge_request: 23334
+author: Jasper Maes
+type: other
diff --git a/spec/support/services/migrate_to_ghost_user_service_shared_examples.rb b/spec/support/services/migrate_to_ghost_user_service_shared_examples.rb
index 1478c6b5a47..62ae95df8c0 100644
--- a/spec/support/services/migrate_to_ghost_user_service_shared_examples.rb
+++ b/spec/support/services/migrate_to_ghost_user_service_shared_examples.rb
@@ -86,7 +86,7 @@ shared_examples "migrating a deleted user's associated records to the ghost user
       end
 
       it "blocks the user before #{record_class_name} migration begins" do
-        expect(service).to receive("migrate_#{record_class_name.parameterize('_').pluralize}".to_sym) do
+        expect(service).to receive("migrate_#{record_class_name.parameterize(separator: '_').pluralize}".to_sym) do
           expect(user.reload).to be_blocked
         end