diff --git a/src/ca-state.hpp b/src/ca-state.hpp
index 4c99185..2204f1c 100644
--- a/src/ca-state.hpp
+++ b/src/ca-state.hpp
@@ -21,7 +21,7 @@
 #ifndef NDNCERT_CA_STATE_HPP
 #define NDNCERT_CA_STATE_HPP
 
-#include "protocol-detail/ndncert-common.hpp"
+#include "detail/ndncert-common.hpp"
 
 namespace ndn {
 namespace ndncert {