diff --git a/runtime/include/current_sandbox_send_response.h b/runtime/include/current_sandbox_send_response.h
index 2fe8c69..f8363bc 100644
--- a/runtime/include/current_sandbox_send_response.h
+++ b/runtime/include/current_sandbox_send_response.h
@@ -40,7 +40,7 @@ current_sandbox_send_response()
 	sandbox->total_time = end_time - sandbox->timestamp_of.request_arrival;
 
 	/* Send HTTP Response Header and Body */
-	rc = http_header_200_write(sandbox->client_socket_descriptor, module_content_type, response_body_size);
+	rc = http_header_200_write(sandbox->client_socket_descriptor, content_type, response_body_size);
 	if (rc < 0) goto err;
 
 	rc = client_socket_send(sandbox->client_socket_descriptor, (const char *)response->buffer, response_body_size,