diff --git a/subprojects/gst-plugins-base/gst-libs/gst/app/gstappsink.c b/subprojects/gst-plugins-base/gst-libs/gst/app/gstappsink.c
index 86da7f4c68..6777ff2307 100644
--- a/subprojects/gst-plugins-base/gst-libs/gst/app/gstappsink.c
+++ b/subprojects/gst-plugins-base/gst-libs/gst/app/gstappsink.c
@@ -1048,6 +1048,7 @@ restart:
   if (G_UNLIKELY (!priv->last_caps &&
           gst_pad_has_current_caps (GST_BASE_SINK_PAD (psink)))) {
     priv->last_caps = gst_pad_get_current_caps (GST_BASE_SINK_PAD (psink));
+    priv->sample = gst_sample_make_writable (priv->sample);
     gst_sample_set_caps (priv->sample, priv->last_caps);
     GST_DEBUG_OBJECT (appsink, "activating pad caps %" GST_PTR_FORMAT,
         priv->last_caps);