diff --git a/testApp/remote/testCodec.cpp b/testApp/remote/testCodec.cpp
index 67a0e0b..e8c12be 100644
--- a/testApp/remote/testCodec.cpp
+++ b/testApp/remote/testCodec.cpp
@@ -49,14 +49,14 @@ namespace epics {
 
     class ReadPollOneCallback {
     public:
-      ~ReadPollOneCallback() {}
+      virtual ~ReadPollOneCallback() {}
       virtual void readPollOne() = 0;
     };
 
 
     class WritePollOneCallback {
     public:
-      ~WritePollOneCallback() {}
+      virtual ~WritePollOneCallback() {}
       virtual void writePollOne() = 0 ;
     };
 
diff --git a/testApp/remote/testServer.cpp b/testApp/remote/testServer.cpp
index c162de5..49014ca 100644
--- a/testApp/remote/testServer.cpp
+++ b/testApp/remote/testServer.cpp
@@ -54,7 +54,7 @@ class StructureChangedCallback {
 public:
     POINTER_DEFINITIONS(StructureChangedCallback);
 
-    ~StructureChangedCallback() {}
+    virtual ~StructureChangedCallback() {}
 
     // TODO for now no BitSets, etc.
     virtual void structureChanged() = 0;