diff --git a/src/db/dbCAC.h b/src/db/dbCAC.h
index 405956d3b..cb8b9a3d7 100644
--- a/src/db/dbCAC.h
+++ b/src/db/dbCAC.h
@@ -125,6 +125,8 @@ private:
 
     void lock () const;
     void unlock () const;
+    void lockOutstandingIO () const;
+    void unlockOutstandingIO () const;
 
     friend dbSubscriptionIO::dbSubscriptionIO ( dbChannelIO &chanIO, cacNotify &, unsigned type, unsigned long count );
     friend dbSubscriptionIO::~dbSubscriptionIO ();
diff --git a/src/db/dbChannelIO.cpp b/src/db/dbChannelIO.cpp
index 205b1a77a..4aec3a37c 100644
--- a/src/db/dbChannelIO.cpp
+++ b/src/db/dbChannelIO.cpp
@@ -178,4 +178,11 @@ int dbChannelIO::subscribe ( unsigned type, unsigned long count,
     return status;
 }
 
+void dbChannelIO::lockOutstandingIO () const
+{
+}
+
+void dbChannelIO::unlockOutstandingIO () const
+{
+}