diff --git a/src/configuration.hpp b/src/configuration.hpp
index 9375758..eee8d35 100644
--- a/src/configuration.hpp
+++ b/src/configuration.hpp
@@ -112,7 +112,8 @@
  *  ]
  * }
  */
-class CaConfig {
+class CaConfig
+{
 public:
   /**
    * Load CA configuration from the file.
@@ -143,7 +144,8 @@
  * For Client configuration format, please refer to:
  *   https://github.com/named-data/ndncert/wiki/Client-Configuration-Sample
  */
-class RequesterCaCache {
+class RequesterCaCache
+{
 public:
   /**
    * @throw std::runtime_error when config file cannot be correctly parsed.