diff --git a/hash.c b/hash.c
index f870bf386a..2b4c8d3400 100644
--- a/hash.c
+++ b/hash.c
@@ -6827,7 +6827,7 @@ static const rb_data_type_t env_data_type = {
  *      alias eql? ==
  *
  *      def hash
- *        @author.hash ^ @title.hash # XOR
+ *        [self.class, @author, @title].hash
  *      end
  *    end
  *