update dir name

Change-Id: I0599388d879b077c15fa515e155795b2b1baa77a
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 {