diff --git a/ext/qt/qtitem.cc b/ext/qt/qtitem.cc
index 65b883eab8..3839aa9756 100644
--- a/ext/qt/qtitem.cc
+++ b/ext/qt/qtitem.cc
@@ -146,6 +146,8 @@ QtGLVideoItem::~QtGLVideoItem()
     gst_object_unref(this->priv->other_context);
   if (this->priv->display)
     gst_object_unref(this->priv->display);
+
+  gst_caps_replace (&this->priv->caps, NULL);
   g_free (this->priv);
   this->priv = NULL;
 }