diff --git a/src/client/clientSync.cpp b/src/client/clientSync.cpp
index 115c70a..3811ee5 100644
--- a/src/client/clientSync.cpp
+++ b/src/client/clientSync.cpp
@@ -295,6 +295,7 @@ struct MonitorSync::SImpl : public ClientChannel::MonitorCallback
     SImpl(epicsEvent *event)
         :ourevent(!event)
         ,event(ourevent ? new epicsEvent : event)
+        ,hadevent(false)
     {}
     virtual ~SImpl()
     {