diff --git a/src/cas/generic/casdef.h b/src/cas/generic/casdef.h
index 9bffc4557..51cbb6fbf 100644
--- a/src/cas/generic/casdef.h
+++ b/src/cas/generic/casdef.h
@@ -417,7 +417,7 @@ class casPV : private casPVI {
 public:
     epicsShareFunc casPV ();
     
-    epicsShareFunc virtual ~casPV () = 0;
+    epicsShareFunc virtual ~casPV ();
     
     //
     // This is called for each PV in the server if