build fix, relative path

Change-Id: I976a3dec39669a308596acbfc2366c402ee0fb05
diff --git a/src/algo/encrypt-params.hpp b/src/algo/encrypt-params.hpp
index 80b97a3..0aa03b2 100644
--- a/src/algo/encrypt-params.hpp
+++ b/src/algo/encrypt-params.hpp
@@ -2,7 +2,7 @@
 #define NDN_GEP_ENCRYPT_PARAMS_HPP
 
 #include <ndn-cxx/encoding/buffer-stream.hpp>
-#include "tlv.hpp"
+#include "../tlv.hpp"
 
 namespace ndn {
 namespace gep {