diff --git a/sources/gstreamer-sharp.metadata b/sources/gstreamer-sharp.metadata
index 5a658c24f9..18344c7a02 100644
--- a/sources/gstreamer-sharp.metadata
+++ b/sources/gstreamer-sharp.metadata
@@ -65,11 +65,25 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 	<attr path="/api/namespace/struct[@cname='GstClockEntry']/field[@cname='destroy_data']" name="hidden">true</attr>
 	<attr path="/api/namespace/object[@cname='GstTask']/field[@cname='notify']" name="hidden">true</attr>
 
-	<!-- Element,BaseSrc are not abstract but should not be instantiable from managed. FIXME: bug in gir metadata? -->
+	<!-- These classes are not abstract but should not be instantiable from managed. FIXME: bug in gir metadata? -->
 	<remove-attr path="/api/namespace/object[@cname='GstElement']" name="abstract" />
-	<attr path="/api/namespace/object[@cname='GstElement']" name="defaultconstructoraccess" >protected</attr>
+	<attr path="/api/namespace/object[@cname='GstElement']" name="defaultconstructoraccess">protected</attr>
 	<remove-attr path="/api/namespace/object[@cname='GstBaseSrc']" name="abstract" />
-	<attr path="/api/namespace/object[@cname='GstBaseSrc']" name="defaultconstructoraccess" >protected</attr>
+	<attr path="/api/namespace/object[@cname='GstBaseSrc']" name="defaultconstructoraccess">protected</attr>
+	<remove-attr path="/api/namespace/object[@cname='GstBaseTransform']" name="abstract" />
+	<attr path="/api/namespace/object[@cname='GstBaseTransform']" name="defaultconstructoraccess">protected</attr>
+	<remove-attr path="/api/namespace/object[@cname='GstAudioFilter']" name="abstract" />
+	<attr path="/api/namespace/object[@cname='GstAudioFilter']" name="defaultconstructoraccess">protected</attr>
+	<remove-attr path="/api/namespace/object[@cname='GstBaseSink']" name="abstract" />
+	<attr path="/api/namespace/object[@cname='GstBaseSink']" name="defaultconstructoraccess">protected</attr>
+	<remove-attr path="/api/namespace/object[@cname='GstBaseParse']" name="abstract" />
+	<attr path="/api/namespace/object[@cname='GstBaseParse']" name="defaultconstructoraccess">protected</attr>
+	<remove-attr path="/api/namespace/object[@cname='GstAudioDecoder']" name="abstract" />
+	<attr path="/api/namespace/object[@cname='GstAudioDecoder']" name="defaultconstructoraccess">protected</attr>
+	<remove-attr path="/api/namespace/object[@cname='GstVideoDecoder']" name="abstract" />
+	<attr path="/api/namespace/object[@cname='GstVideoDecoder']" name="defaultconstructoraccess">protected</attr>
+	<remove-attr path="/api/namespace/object[@cname='GstVideoFilter']" name="abstract" />
+	<attr path="/api/namespace/object[@cname='GstVideoFilter']" name="defaultconstructoraccess">protected</attr>
 
 	<!-- Add miniobject methods to all miniobject types -->
 	<copy-node path="/api/namespace/struct[@cname='GstMiniObject']//method">/api/namespace//boxed[field/@cname='mini_object']</copy-node>