diff --git a/sys/decklink/capture.h b/sys/decklink/capture.h
index 029500f2cf..e6c5846486 100644
--- a/sys/decklink/capture.h
+++ b/sys/decklink/capture.h
@@ -7,7 +7,7 @@ class DeckLinkCaptureDelegate : public IDeckLinkInputCallback
 {
   public:
     DeckLinkCaptureDelegate();
-    ~DeckLinkCaptureDelegate();
+    virtual ~DeckLinkCaptureDelegate();
 
     virtual HRESULT STDMETHODCALLTYPE QueryInterface(REFIID iid, LPVOID *ppv) { return E_NOINTERFACE; }
     virtual ULONG STDMETHODCALLTYPE AddRef(void);
diff --git a/sys/decklink/gstdecklinksrc.cpp b/sys/decklink/gstdecklinksrc.cpp
index 5769c174a8..939fb8b8eb 100644
--- a/sys/decklink/gstdecklinksrc.cpp
+++ b/sys/decklink/gstdecklinksrc.cpp
@@ -408,7 +408,6 @@ static gboolean
 gst_decklink_src_start (GstElement * element)
 {
   GstDecklinkSrc *decklinksrc = GST_DECKLINK_SRC (element);
-  DeckLinkCaptureDelegate *delegate;
   BMDAudioSampleType sample_depth;
   int channels;
   HRESULT ret;
@@ -431,9 +430,9 @@ gst_decklink_src_start (GstElement * element)
     return FALSE;
   }
 
-  delegate = new DeckLinkCaptureDelegate ();
-  delegate->priv = decklinksrc;
-  ret = decklinksrc->input->SetCallback (delegate);
+  decklinksrc->delegate = new DeckLinkCaptureDelegate ();
+  decklinksrc->delegate->priv = decklinksrc;
+  ret = decklinksrc->input->SetCallback (decklinksrc->delegate);
   if (ret != S_OK) {
     GST_ERROR ("set callback failed (input source)");
     return FALSE;
@@ -559,6 +558,10 @@ gst_decklink_src_stop (GstElement * element)
   decklinksrc->input->DisableVideoInput ();
   decklinksrc->input->DisableAudioInput ();
 
+  decklinksrc->input->SetCallback (NULL);
+  delete decklinksrc->delegate;
+  decklinksrc->delegate = NULL;
+
   g_list_free_full (decklinksrc->pending_events,
       (GDestroyNotify) gst_mini_object_unref);
   decklinksrc->pending_events = NULL;
diff --git a/sys/decklink/gstdecklinksrc.h b/sys/decklink/gstdecklinksrc.h
index f071b662b2..eb7a252c28 100644
--- a/sys/decklink/gstdecklinksrc.h
+++ b/sys/decklink/gstdecklinksrc.h
@@ -22,6 +22,7 @@
 
 #include <gst/gst.h>
 #include "gstdecklink.h"
+#include "capture.h"
 
 G_BEGIN_DECLS
 
@@ -52,6 +53,7 @@ struct _GstDecklinkSrc
   IDeckLink *decklink;
   IDeckLinkInput *input;
   IDeckLinkConfiguration *config;
+  DeckLinkCaptureDelegate *delegate;
 
   GMutex mutex;
   GCond cond;