diff --git a/src/ca/CASG.cpp b/src/ca/CASG.cpp
index c0e71aae4..bd3990b20 100644
--- a/src/ca/CASG.cpp
+++ b/src/ca/CASG.cpp
@@ -276,7 +276,7 @@ void CASG::exception ( int status, const char *pContext,
         lineNo, chan, type, count, op );
 }
 
-void CASG::operator delete ( void * pCadaver )
+void CASG::operator delete ( void * )
 {
     // Visual C++ .net appears to require operator delete if
     // placement operator delete is defined? I smell a ms rat
diff --git a/src/ca/comBuf.cpp b/src/ca/comBuf.cpp
index b211b3157..6170fba7c 100644
--- a/src/ca/comBuf.cpp
+++ b/src/ca/comBuf.cpp
@@ -130,7 +130,7 @@ void comBuf::throwInsufficentBytesException ()
     throw comBuf::insufficentBytesAvailable ();
 }
 
-void comBuf::operator delete ( void *pCadaver ) epics_throws (())
+void comBuf::operator delete ( void * ) epics_throws (())
 {
     // Visual C++ .net appears to require operator delete if
     // placement operator delete is defined? I smell a ms rat
diff --git a/src/ca/getCallback.cpp b/src/ca/getCallback.cpp
index 4bc90ffb5..791eb19c6 100644
--- a/src/ca/getCallback.cpp
+++ b/src/ca/getCallback.cpp
@@ -71,7 +71,7 @@ void getCallback::exception (
     this->chan.getClientCtx().destroyGetCallback ( *this );
 }
 
-void getCallback::operator delete ( void *pCadaver )
+void getCallback::operator delete ( void * )
 {
     // Visual C++ .net appears to require operator delete if
     // placement operator delete is defined? I smell a ms rat
diff --git a/src/ca/getCopy.cpp b/src/ca/getCopy.cpp
index f7c4fe65a..855baaadc 100644
--- a/src/ca/getCopy.cpp
+++ b/src/ca/getCopy.cpp
@@ -88,7 +88,7 @@ void getCopy::show ( unsigned level ) const
     }
 }
 
-void getCopy::operator delete ( void *pCadaver )
+void getCopy::operator delete ( void * )
 {
     // Visual C++ .net appears to require operator delete if
     // placement operator delete is defined? I smell a ms rat
diff --git a/src/ca/netReadNotifyIO.cpp b/src/ca/netReadNotifyIO.cpp
index bc786f3b4..ceda8cea6 100644
--- a/src/ca/netReadNotifyIO.cpp
+++ b/src/ca/netReadNotifyIO.cpp
@@ -80,7 +80,7 @@ nciu & netReadNotifyIO::channel () const
     return this->chan;
 }
 
-void netReadNotifyIO::operator delete ( void * p )
+void netReadNotifyIO::operator delete ( void * )
 {
     // Visual C++ .net appears to require operator delete if
     // placement operator delete is defined? I smell a ms rat
diff --git a/src/ca/netSubscription.cpp b/src/ca/netSubscription.cpp
index 97f408c72..b617b1669 100644
--- a/src/ca/netSubscription.cpp
+++ b/src/ca/netSubscription.cpp
@@ -93,7 +93,7 @@ nciu & netSubscription::channel () const
     return this->chan;
 }
 
-void netSubscription::operator delete ( void * p )
+void netSubscription::operator delete ( void * )
 {
     // Visual C++ .net appears to require operator delete if
     // placement operator delete is defined? I smell a ms rat