diff --git a/activerecord/lib/active_record/delegated_type.rb b/activerecord/lib/active_record/delegated_type.rb
index e2609a85d4..2cddd2fafe 100644
--- a/activerecord/lib/active_record/delegated_type.rb
+++ b/activerecord/lib/active_record/delegated_type.rb
@@ -207,7 +207,7 @@ def define_delegated_type_methods(role, types:, options:)
         end
 
         types.each do |type|
-          scope_name = type.tableize.gsub("/", "_")
+          scope_name = type.tableize.tr("/", "_")
           singular   = scope_name.singularize
           query      = "#{singular}?"