diff --git a/occ_manager.hpp b/occ_manager.hpp
index 97bf2b1..e9a469c 100644
--- a/occ_manager.hpp
+++ b/occ_manager.hpp
@@ -74,7 +74,7 @@
      *
      *  @param[in] event - Unique ptr reference to sd_event
      */
-    Manager(EventPtr& event) :
+    explicit Manager(EventPtr& event) :
         event(event), pollInterval(defaultPollingInterval),
         sdpEvent(sdeventplus::Event::get_default()),
         _pollTimer(