diff --git a/tests/unit/util/placeholders2.t.cpp b/tests/unit/util/placeholders2.t.cpp
index 187daa9..d8b8c93 100644
--- a/tests/unit/util/placeholders2.t.cpp
+++ b/tests/unit/util/placeholders2.t.cpp
@@ -22,7 +22,7 @@
 // Bug 2109 test case
 
 // interest.hpp includes common.hpp; common.hpp shouldn't be used from external program
-#include "interest.hpp"
+#include "ndn-cxx/interest.hpp"
 
 #include <boost/bind.hpp>