diff --git a/daemon/table/pit-entry.hpp b/daemon/table/pit-entry.hpp
index 282d1df..5f77a4d 100644
--- a/daemon/table/pit-entry.hpp
+++ b/daemon/table/pit-entry.hpp
@@ -32,11 +32,11 @@
 
 namespace nfd {
 
-class NameTree;
-
 namespace name_tree {
+class NameTree;
 class Entry;
 } // namespace name_tree
+using name_tree::NameTree;
 
 namespace pit {