diff --git a/girs/GstNet-1.0.gir b/girs/GstNet-1.0.gir
index 4b85d6dbcc..6e0605afcd 100644
--- a/girs/GstNet-1.0.gir
+++ b/girs/GstNet-1.0.gir
@@ -587,12 +587,12 @@ GstPtpClock::internal-clock property will become non-NULL. You can
 check this with gst_clock_wait_for_sync(), the GstClock::synced signal and
 gst_clock_is_synced().</doc>
         <source-position filename="../subprojects/gstreamer/libs/gst/net/gstptpclock.h"/>
-        <return-value transfer-ownership="full">
+        <return-value transfer-ownership="full" nullable="1">
           <doc xml:space="preserve" filename="../subprojects/gstreamer/libs/gst/net/gstptpclock.c">A new #GstClock</doc>
           <type name="Gst.Clock" c:type="GstClock*"/>
         </return-value>
         <parameters>
-          <parameter name="name" transfer-ownership="none">
+          <parameter name="name" transfer-ownership="none" nullable="1" allow-none="1">
             <doc xml:space="preserve" filename="../subprojects/gstreamer/libs/gst/net/gstptpclock.c">Name of the clock</doc>
             <type name="utf8" c:type="const gchar*"/>
           </parameter>
diff --git a/subprojects/gstreamer/libs/gst/net/gstptpclock.c b/subprojects/gstreamer/libs/gst/net/gstptpclock.c
index 09f482ecd1..0b69eb61cf 100644
--- a/subprojects/gstreamer/libs/gst/net/gstptpclock.c
+++ b/subprojects/gstreamer/libs/gst/net/gstptpclock.c
@@ -3266,7 +3266,7 @@ gst_ptp_clock_get_internal_time (GstClock * clock)
 
 /**
  * gst_ptp_clock_new:
- * @name: Name of the clock
+ * @name: (nullable): Name of the clock
  * @domain: PTP domain
  *
  * Creates a new PTP clock instance that exports the PTP time of the master
@@ -3281,7 +3281,7 @@ gst_ptp_clock_get_internal_time (GstClock * clock)
  * check this with gst_clock_wait_for_sync(), the GstClock::synced signal and
  * gst_clock_is_synced().
  *
- * Returns: (transfer full): A new #GstClock
+ * Returns: (transfer full) (nullable): A new #GstClock
  *
  * Since: 1.6
  */