diff --git a/src/configuration.cpp b/src/configuration.cpp
index 9af6f28..09b5f68 100644
--- a/src/configuration.cpp
+++ b/src/configuration.cpp
@@ -20,9 +20,9 @@
 
 #include "configuration.hpp"
 #include "identity-challenge/challenge-module.hpp"
+#include "name-assignment/assignment-func.hpp"
 #include <ndn-cxx/util/io.hpp>
 #include <boost/filesystem.hpp>
-#include "name-assignment/assignment-func.hpp"
 
 namespace ndn {
 namespace ndncert {