diff --git a/tools/wscript b/tools/wscript
index 659d07c..ade7a63 100644
--- a/tools/wscript
+++ b/tools/wscript
@@ -35,7 +35,7 @@
         bld(features=['cxx', 'cxxprogram'],
             target="../bin/%s" % name,
             source=[i] + bld.path.ant_glob(['%s/**/*.cpp' % name]),
-            use='NDN_CXX'
+            use='NDN_CXX JSON'
             )
 
     # List all directories files (tool can has multiple .cpp in the directory)