diff --git a/src/ca/cacNotify.cpp b/src/ca/cacNotify.cpp
index 59159fe0a..c624665b1 100644
--- a/src/ca/cacNotify.cpp
+++ b/src/ca/cacNotify.cpp
@@ -31,4 +31,13 @@ cacNotify::~cacNotify ()
 {
 }
 
+void cacNotify::callbackLock () 
+{
+}
+
+void cacNotify::callbackUnlock () 
+{
+}
+
+