diff --git a/lib/active_model/serializer/association/has_many.rb b/lib/active_model/serializer/association/has_many.rb
index d1b8d8eb..52d66d26 100644
--- a/lib/active_model/serializer/association/has_many.rb
+++ b/lib/active_model/serializer/association/has_many.rb
@@ -5,7 +5,11 @@ module ActiveModel
         def initialize(name, *args)
           super
           @root_key = @embedded_key
-          @key ||= "#{name.to_s.singularize}_ids"
+          @key ||= case CONFIG.default_key_type
+            when :name then name.to_s.pluralize
+            else "#{name.to_s.singularize}_ids"
+          end
+
         end
 
         def serializer_class(object, _)
diff --git a/lib/active_model/serializer/association/has_one.rb b/lib/active_model/serializer/association/has_one.rb
index 3b9acddf..38c8b9bc 100644
--- a/lib/active_model/serializer/association/has_one.rb
+++ b/lib/active_model/serializer/association/has_one.rb
@@ -5,7 +5,10 @@ module ActiveModel
         def initialize(name, *args)
           super
           @root_key = @embedded_key.to_s.pluralize
-          @key ||= "#{name}_id"
+          @key ||= case CONFIG.default_key_type
+            when :name then name.to_s.singularize
+            else "#{name}_id"
+          end
         end
 
         def serializer_class(object, options = {})