diff --git a/src/ca/repeater.cpp b/src/ca/repeater.cpp
index 4febd693a..03dc5b431 100644
--- a/src/ca/repeater.cpp
+++ b/src/ca/repeater.cpp
@@ -114,7 +114,6 @@ static bool makeSocket ( unsigned short port, bool reuseAddr, SOCKET * pSock )
 		struct sockaddr_in ia;
 		struct sockaddr sa;
 	} bd;
-    int flag;
 
     SOCKET sock = epicsSocketCreate ( AF_INET, SOCK_DGRAM, 0 );     
     if ( sock == INVALID_SOCKET ) {
diff --git a/src/ca/tcpiiu.cpp b/src/ca/tcpiiu.cpp
index 0a9083f49..f78d8588b 100644
--- a/src/ca/tcpiiu.cpp
+++ b/src/ca/tcpiiu.cpp
@@ -1482,7 +1482,7 @@ void tcpSendThread::interruptSocketSend ()
     }
 }
 
-void tcpiiu::operator delete ( void * pCadaver )
+void tcpiiu::operator delete ( void * /* pCadaver */ )
 {
     // Visual C++ .net appears to require operator delete if
     // placement operator delete is defined? I smell a ms rat
diff --git a/src/cas/example/directoryService/directoryServer.cc b/src/cas/example/directoryService/directoryServer.cc
index 984a0a7d3..45f04b4d6 100644
--- a/src/cas/example/directoryService/directoryServer.cc
+++ b/src/cas/example/directoryService/directoryServer.cc
@@ -96,7 +96,7 @@ pvExistReturn directoryServer::pvExistTest
 // directoryServer::pvExistTest()
 //
 pvExistReturn directoryServer::pvExistTest
-	( const casCtx & ctx, const char * pPVName )
+	( const casCtx & /* ctx */, const char * pPVName )
 {
 	//
 	// lifetime of id is shorter than lifetime of pName
diff --git a/src/cas/generic/chanIntfForPV.h b/src/cas/generic/chanIntfForPV.h
index 808f3f186..a6a1335a2 100644
--- a/src/cas/generic/chanIntfForPV.h
+++ b/src/cas/generic/chanIntfForPV.h
@@ -41,7 +41,7 @@ class casPVI;
 class casEventMask;
 class gdd;
 
-class casChannelDestroyFromPV {
+class casChannelDestroyFromPV { // X aCC 655
 public:
     virtual void postDestroyEvent () = 0;
 };
diff --git a/src/libCom/misc/ipAddrToAsciiAsynchronous.h b/src/libCom/misc/ipAddrToAsciiAsynchronous.h
index d6b29de5e..5ed8de172 100644
--- a/src/libCom/misc/ipAddrToAsciiAsynchronous.h
+++ b/src/libCom/misc/ipAddrToAsciiAsynchronous.h
@@ -36,7 +36,7 @@ public:
     virtual ~ipAddrToAsciiCallBack () = 0;
 };
 
-class epicsShareClass ipAddrToAsciiTransaction {
+class epicsShareClass ipAddrToAsciiTransaction { // X aCC 655
 public:
     virtual void release () = 0; 
     virtual void ipAddrToAscii ( const osiSockAddr &, ipAddrToAsciiCallBack & ) = 0;
@@ -46,7 +46,7 @@ protected:
     virtual ~ipAddrToAsciiTransaction () = 0;
 };
 
-class epicsShareClass ipAddrToAsciiEngine {
+class epicsShareClass ipAddrToAsciiEngine { // X aCC 655
 public:
     virtual void release () = 0; 
     virtual ipAddrToAsciiTransaction & createTransaction () = 0;