diff --git a/src/ca/cacIO.h b/src/ca/cacIO.h
index 675e5c100..6b8326e8b 100644
--- a/src/ca/cacIO.h
+++ b/src/ca/cacIO.h
@@ -33,15 +33,12 @@ public:
     virtual void exceptionNotify ( int status, const char *pContext, unsigned type, unsigned long count );
 private:
     cacNotifyIO *pIO;
-    virtual void lock ();
-    virtual void unlock ();
-    static osiMutex defaultMutex;
     friend class cacNotifyIO;
 };
 
 class epicsShareClass cacNotifyIO {
 public:
-    cacNotifyIO ( cacNotify &);
+    cacNotifyIO ( cacNotify & );
     virtual ~cacNotifyIO () = 0;
     virtual void destroy () = 0;
     void completionNotify ();
@@ -98,7 +95,6 @@ private:
     virtual void exceptionNotify ( int status, const char *pContext );
     virtual void connectTimeoutNotify ();
 
-
     friend class cacChannelIO;
 };
 
diff --git a/src/ca/cacNotify.cpp b/src/ca/cacNotify.cpp
index a89e76421..51c8afda8 100644
--- a/src/ca/cacNotify.cpp
+++ b/src/ca/cacNotify.cpp
@@ -12,8 +12,6 @@
 
 #include "iocinf.h"
 
-osiMutex cacNotify::defaultMutex;
-
 cacNotify::cacNotify () : pIO (0)
 {
 }
@@ -27,16 +25,6 @@ cacNotify::~cacNotify ()
     }
 }
 
-void cacNotify::lock ()
-{
-    this->defaultMutex.lock ();
-}
-
-void cacNotify::unlock ()
-{
-    this->defaultMutex.unlock ();
-}
-
 void cacNotify::completionNotify ()
 {
     ca_printf ("CAC: IO completion with no handler installed?\n");