diff --git a/src/ca/iocinf.h b/src/ca/iocinf.h
index 793e499b7..1a7286d5a 100644
--- a/src/ca/iocinf.h
+++ b/src/ca/iocinf.h
@@ -906,7 +906,7 @@ private:
 class recvProcessThread : public epicsThreadRunable {
 public:
     recvProcessThread ( class cac *pcacIn );
-    ~recvProcessThread ();
+    virtual ~recvProcessThread ();
     void run ();
     void signalShutDown ();
     void enable ();
@@ -936,7 +936,7 @@ private:
 class sendProcessThread : public epicsThreadRunable {
 public:
     sendProcessThread ( class cac &cacIn );
-    ~sendProcessThread ();
+    virtual ~sendProcessThread ();
     void run ();
     void signalShutDown ();
     void signalActivity ();
@@ -966,7 +966,7 @@ private:
     void exceptionNotify ( int status, const char *pContext, unsigned type, unsigned long count );
     void lock () const;
     void unlock () const;
-    ~syncGroupNotify (); // allocate only from pool
+    virtual ~syncGroupNotify (); // allocate only from pool
 
     struct CASG &sg;
     unsigned magic;
diff --git a/src/libCom/misc/ipAddrToAsciiAsynchronous.h b/src/libCom/misc/ipAddrToAsciiAsynchronous.h
index 768ed65db..743b11739 100644
--- a/src/libCom/misc/ipAddrToAsciiAsynchronous.h
+++ b/src/libCom/misc/ipAddrToAsciiAsynchronous.h
@@ -31,8 +31,8 @@ class ipAddrToAsciiAsynchronous;
 class ipAddrToAsciiEngine : public epicsThreadRunable {
 public:
     epicsShareFunc ipAddrToAsciiEngine ( const char *pName );
-    epicsShareFunc ~ipAddrToAsciiEngine ();
-    virtual void run();
+    virtual epicsShareFunc ~ipAddrToAsciiEngine ();
+    virtual void run ();
     epicsShareFunc void show ( unsigned level ) const;
 private:
     epicsThread &thread;