diff --git a/tests/wscript b/tests/wscript
index 823d25e..3b9e628 100644
--- a/tests/wscript
+++ b/tests/wscript
@@ -37,6 +37,7 @@
             source=bld.path.ant_glob(['*.cpp'], excl='main.cpp'),
             use='core-objects',
             headers='../common.hpp boost-test.hpp',
+            defines='UNIT_TEST_CONFIG_PATH=\"%s/tmp-files/\"' % bld.bldnode,
           )
 
         for module, name in {"core": "NFD Core Tests",
@@ -62,6 +63,7 @@
                 use='%s-objects unit-tests-base unit-tests-%s-main' % (module, module),
                 includes='.',
                 install_path=None,
+                defines='UNIT_TEST_CONFIG_PATH=\"%s/tmp-files/\"' % bld.bldnode,
               )
 
             if bld.env['HAVE_LIBPCAP']: