diff --git a/lib/fast_jsonapi/relationship.rb b/lib/fast_jsonapi/relationship.rb
index b3a2d2b..15b381c 100644
--- a/lib/fast_jsonapi/relationship.rb
+++ b/lib/fast_jsonapi/relationship.rb
@@ -42,8 +42,6 @@ module FastJsonapi
       record.send(object_method_name)
     end
 
-    private
-
     def include_relationship?(record, serialization_params)
       if conditional_proc.present?
         conditional_proc.call(record, serialization_params)
@@ -52,6 +50,8 @@ module FastJsonapi
       end
     end
 
+    private
+
     def ids_hash_from_record_and_relationship(record, params = {})
       return ids_hash(
         fetch_id(record, params)
diff --git a/lib/fast_jsonapi/serialization_core.rb b/lib/fast_jsonapi/serialization_core.rb
index 9ee8f8e..0b1181e 100644
--- a/lib/fast_jsonapi/serialization_core.rb
+++ b/lib/fast_jsonapi/serialization_core.rb
@@ -112,8 +112,7 @@ module FastJsonapi
           items.each do |item|
             next unless relationships_to_serialize && relationships_to_serialize[item]
             relationship_item = relationships_to_serialize[item]
-            conditional_proc = relationship_item.conditional_proc
-            next if conditional_proc && !conditional_proc.call(record, params)
+            next unless relationship_item.include_relationship?(record, params)
             raise NotImplementedError if relationship_item.polymorphic.is_a?(Hash)
             record_type = relationship_item.record_type
             serializer = relationship_item.serializer.to_s.constantize