diff --git a/lib/active_model_serializers/adapter/attributes.rb b/lib/active_model_serializers/adapter/attributes.rb
index 3372e2be8..0ba267d32 100644
--- a/lib/active_model_serializers/adapter/attributes.rb
+++ b/lib/active_model_serializers/adapter/attributes.rb
@@ -9,7 +9,7 @@ def initialize(*)
       end
 
       def serializable_hash(options = nil)
-        options = serialization_options(options)
+        options = serialization_options(options.dup)
         options[:fields] ||= instance_options[:fields]
         serialized_hash = serializer.serializable_hash(instance_options, options, self)