diff --git a/lib/aws_lambda_ric/lambda_logger.rb b/lib/aws_lambda_ric/lambda_logger.rb
index 8d98e37..d9f4664 100644
--- a/lib/aws_lambda_ric/lambda_logger.rb
+++ b/lib/aws_lambda_ric/lambda_logger.rb
@@ -4,7 +4,7 @@ class LambdaLogger
   class << self
     def log_error(exception:, message: nil)
       puts message if message
-      puts JSON.pretty_unparse(exception.to_lambda_response)
+      puts JSON.pretty_generate(exception.to_lambda_response)
     end
   end
 end