diff --git a/src/ca/access.cpp b/src/ca/access.cpp
index 85d654acb..18e239079 100644
--- a/src/ca/access.cpp
+++ b/src/ca/access.cpp
@@ -790,7 +790,7 @@ extern "C" unsigned epicsShareAPI ca_get_ioc_connection_count ()
     return pcac->connectionCount ();
 }
 
-extern "C" epicsShareFunc int epicsShareAPI ca_channel_status ( threadId tid )
+extern "C" epicsShareFunc int epicsShareAPI ca_channel_status ( threadId /* tid */ )
 {
     printf ("new OSI API does not allow peeking at thread private storage of another thread\n");
     printf ("please call \"ca_client_status ( unsigned level )\" from the subsystem specific diagnostic code.\n");
diff --git a/src/ca/cac.cpp b/src/ca/cac.cpp
index 78ee46636..eb9b3dc58 100644
--- a/src/ca/cac.cpp
+++ b/src/ca/cac.cpp
@@ -176,7 +176,7 @@ cac::~cac ()
         while ( piiu.valid () ) {
             tsDLIterBD <tcpiiu> pnext = piiu.itemAfter ();
             {
-                epicsAutoMutex autoMutex ( this->defaultMutex );
+                epicsAutoMutex autoMutexTmp ( this->defaultMutex );
                 piiu->disconnectAllChan ( *this->pudpiiu );
             }
             piiu->disconnect ();
@@ -261,7 +261,7 @@ void cac::processRecvBacklog ()
             }
 
             {
-                epicsAutoMutex autoMutex ( this->defaultMutex );
+                epicsAutoMutex autoMutexTmp ( this->defaultMutex );
                 piiu->disconnectAllChan ( *this->pudpiiu );
             }