diff --git a/src/challenge-module/challenge-credential.cpp b/src/challenge-module/challenge-credential.cpp
index a79facb..a41aa56 100644
--- a/src/challenge-module/challenge-credential.cpp
+++ b/src/challenge-module/challenge-credential.cpp
@@ -18,13 +18,10 @@
  */
 
 #include "challenge-credential.hpp"
-
 #include <iostream>
 #include <ndn-cxx/security/verification-helpers.hpp>
 #include <ndn-cxx/util/io.hpp>
 
-#include "../logging.hpp"
-
 namespace ndn {
 namespace ndncert {
 
diff --git a/src/challenge-module/challenge-email.cpp b/src/challenge-module/challenge-email.cpp
index cac0084..aec7859 100644
--- a/src/challenge-module/challenge-email.cpp
+++ b/src/challenge-module/challenge-email.cpp
@@ -19,11 +19,8 @@
  */
 
 #include "challenge-email.hpp"
-
-#include <regex>
-
 #include "../ca-module.hpp"
-#include "../logging.hpp"
+#include <regex>
 
 namespace ndn {
 namespace ndncert {
diff --git a/src/challenge-module/challenge-pin.cpp b/src/challenge-module/challenge-pin.cpp
index 556929f..9302e42 100644
--- a/src/challenge-module/challenge-pin.cpp
+++ b/src/challenge-module/challenge-pin.cpp
@@ -19,11 +19,8 @@
  */
 
 #include "challenge-pin.hpp"
-
 #include <ndn-cxx/util/random.hpp>
 
-#include "logging.hpp"
-
 namespace ndn {
 namespace ndncert {