diff --git a/tests/check/libs/netbuffer.c b/tests/check/libs/netbuffer.c
index 93469ed011..3236a0fa82 100644
--- a/tests/check/libs/netbuffer.c
+++ b/tests/check/libs/netbuffer.c
@@ -50,7 +50,7 @@ GST_START_TEST (test_netbuffer_copy)
   GST_BUFFER_FLAG_SET (netbuf, GST_BUFFER_FLAG_DISCONT);
   GST_BUFFER_FLAG_SET (netbuf, GST_BUFFER_FLAG_READONLY);
 
-  copy = (GstNetBuffer *) gst_buffer_copy (netbuf);
+  copy = (GstNetBuffer *) gst_buffer_copy (GST_BUFFER_CAST (netbuf));
   fail_unless (copy != NULL, "failed to copy net buffer");
   fail_unless (GST_IS_NETBUFFER (copy), "copied buffer is not a GstNetBuffer!");
 
@@ -74,8 +74,8 @@ GST_START_TEST (test_netbuffer_copy)
   fail_unless (port == ipv6_port,
       "Copied buffer has wrong IPv6 destination port");
 
-  gst_buffer_unref (netbuf);
-  gst_buffer_unref (copy);
+  gst_buffer_unref (GST_BUFFER_CAST (netbuf));
+  gst_buffer_unref (GST_BUFFER_CAST (copy));
 }
 
 GST_END_TEST;