diff --git a/panda/src/express/weakPointerCallback.cxx b/panda/src/express/weakPointerCallback.cxx
index 279bc961bc..182f41c420 100644
--- a/panda/src/express/weakPointerCallback.cxx
+++ b/panda/src/express/weakPointerCallback.cxx
@@ -17,3 +17,12 @@
 ////////////////////////////////////////////////////////////////////
 
 #include "weakPointerCallback.h"
+
+////////////////////////////////////////////////////////////////////
+//     Function: WeakPointerCallback::Destructor
+//       Access: Public, Virtual
+//  Description:
+////////////////////////////////////////////////////////////////////
+WeakPointerCallback::
+~WeakPointerCallback() {
+}
diff --git a/panda/src/express/weakPointerCallback.h b/panda/src/express/weakPointerCallback.h
index fd0b6e881a..2800e224d4 100644
--- a/panda/src/express/weakPointerCallback.h
+++ b/panda/src/express/weakPointerCallback.h
@@ -30,6 +30,7 @@
 ////////////////////////////////////////////////////////////////////
 class EXPCL_PANDAEXPRESS WeakPointerCallback {
 public:
+  virtual ~WeakPointerCallback();
   virtual void wp_callback(void *pointer)=0;
 };