diff --git a/include/ndn-cpp/common.hpp b/include/ndn-cpp/common.hpp
index 1813b25..e266750 100644
--- a/include/ndn-cpp/common.hpp
+++ b/include/ndn-cpp/common.hpp
@@ -93,6 +93,9 @@
 std::string 
 toHex(const std::vector<uint8_t>& array);
 
+MillisecondsSince1970
+getNow();
+
 }
 
 #endif