diff --git a/activerecord/lib/active_record/named_scope.rb b/activerecord/lib/active_record/named_scope.rb
index d606934dce..ff6c041ef4 100644
--- a/activerecord/lib/active_record/named_scope.rb
+++ b/activerecord/lib/active_record/named_scope.rb
@@ -165,7 +165,7 @@ module ActiveRecord
       end
 
       def ==(other)
-        other.respond_to?(:to_a) ? to_a == other.to_a : false
+        other.respond_to?(:to_ary) ? to_a == other.to_a : false
       end
 
       private