diff --git a/src/ca/bhe.cpp b/src/ca/bhe.cpp
index a035f748f..94e5f5cef 100644
--- a/src/ca/bhe.cpp
+++ b/src/ca/bhe.cpp
@@ -45,7 +45,7 @@
  * between the 1st and 2nd beacons)
  */
 bhe::bhe ( const epicsTime & initialTimeStamp, 
-          unsigned initialBeaconNumber, const inetAddrID & addr ) :
+          unsigned initialBeaconNumber, const inetAddrID & addr ) throw () :
     inetAddrID ( addr ), timeStamp ( initialTimeStamp ), averagePeriod ( - DBL_MAX ),
     lastBeaconNumber ( initialBeaconNumber )
 {
diff --git a/src/ca/tcpiiu.cpp b/src/ca/tcpiiu.cpp
index a2650ca1b..21a68343b 100644
--- a/src/ca/tcpiiu.cpp
+++ b/src/ca/tcpiiu.cpp
@@ -139,7 +139,7 @@ void tcpSendThread::run ()
 }
 
 unsigned tcpiiu::sendBytes ( const void *pBuf, 
-                            unsigned nBytesInBuf )
+                            unsigned nBytesInBuf ) throw ()
 {
     int status;
     unsigned nBytes = 0u;
@@ -202,7 +202,7 @@ unsigned tcpiiu::sendBytes ( const void *pBuf,
     return nBytes;
 }
 
-unsigned tcpiiu::recvBytes ( void * pBuf, unsigned nBytesInBuf )
+unsigned tcpiiu::recvBytes ( void * pBuf, unsigned nBytesInBuf ) throw ()
 {
     if ( this->state != iiucs_connected && 
             this->state != iiucs_clean_shutdown ) {
diff --git a/src/ca/virtualCircuit.h b/src/ca/virtualCircuit.h
index 1588a9438..d05ee30be 100644
--- a/src/ca/virtualCircuit.h
+++ b/src/ca/virtualCircuit.h
@@ -170,8 +170,8 @@ private:
     bool recvProcessPostponedFlush;
 
     bool processIncoming ( epicsGuard < callbackMutex > & );
-    unsigned sendBytes ( const void *pBuf, unsigned nBytesInBuf );
-    unsigned recvBytes ( void *pBuf, unsigned nBytesInBuf );
+    unsigned sendBytes ( const void *pBuf, unsigned nBytesInBuf ) throw ();
+    unsigned recvBytes ( void *pBuf, unsigned nBytesInBuf ) throw ();
     void connect ();
     const char * pHostName () const;