diff --git a/src/ca-storage/ca-memory.cpp b/src/ca-detail/ca-memory.cpp
similarity index 100%
rename from src/ca-storage/ca-memory.cpp
rename to src/ca-detail/ca-memory.cpp
diff --git a/src/ca-storage/ca-memory.hpp b/src/ca-detail/ca-memory.hpp
similarity index 100%
rename from src/ca-storage/ca-memory.hpp
rename to src/ca-detail/ca-memory.hpp
diff --git a/src/ca-storage/ca-sqlite.cpp b/src/ca-detail/ca-sqlite.cpp
similarity index 100%
rename from src/ca-storage/ca-sqlite.cpp
rename to src/ca-detail/ca-sqlite.cpp
diff --git a/src/ca-storage/ca-sqlite.hpp b/src/ca-detail/ca-sqlite.hpp
similarity index 100%
rename from src/ca-storage/ca-sqlite.hpp
rename to src/ca-detail/ca-sqlite.hpp
diff --git a/src/ca-storage/ca-storage.cpp b/src/ca-detail/ca-storage.cpp
similarity index 97%
rename from src/ca-storage/ca-storage.cpp
rename to src/ca-detail/ca-storage.cpp
index 657e41e..d0fac8f 100644
--- a/src/ca-storage/ca-storage.cpp
+++ b/src/ca-detail/ca-storage.cpp
@@ -18,7 +18,7 @@
  * See AUTHORS.md for complete list of ndncert authors and contributors.
  */
 
-#include "ca-storage/ca-storage.hpp"
+#include "ca-detail/ca-storage.hpp"
 
 namespace ndn {
 namespace ndncert {
diff --git a/src/ca-storage/ca-storage.hpp b/src/ca-detail/ca-storage.hpp
similarity index 100%
rename from src/ca-storage/ca-storage.hpp
rename to src/ca-detail/ca-storage.hpp
diff --git a/src/ca-module.hpp b/src/ca-module.hpp
index 652a7e4..3fb79cb 100644
--- a/src/ca-module.hpp
+++ b/src/ca-module.hpp
@@ -23,7 +23,7 @@
 
 #include "configuration.hpp"
 #include "protocol-detail/crypto-helper.hpp"
-#include "ca-storage/ca-storage.hpp"
+#include "ca-detail/ca-storage.hpp"
 
 namespace ndn {
 namespace ndncert {