diff --git a/core/common.hpp b/core/common.hpp
index 0e47227..38cf178 100644
--- a/core/common.hpp
+++ b/core/common.hpp
@@ -112,7 +112,7 @@
 namespace lp = ndn::lp;
 namespace name = ndn::name;
 namespace scheduler = ndn::scheduler;
-namespace signal = ndn::util::signal;
+namespace signal = ndn::signal;
 namespace time = ndn::time;
 using namespace ndn::time_literals;