diff --git a/girs/GstPbutils-1.0.gir b/girs/GstPbutils-1.0.gir
index 057276f32a..473259b73a 100644
--- a/girs/GstPbutils-1.0.gir
+++ b/girs/GstPbutils-1.0.gir
@@ -3169,9 +3169,9 @@ rate.</doc>
     <function name="codec_utils_av1_create_av1c_from_caps" c:identifier="gst_codec_utils_av1_create_av1c_from_caps" version="1.26">
       <doc xml:space="preserve" filename="../subprojects/gst-plugins-base/gst-libs/gst/pbutils/codec-utils.c">Creates the corresponding AV1 Codec Configuration Record</doc>
       <source-position filename="../subprojects/gst-plugins-base/gst-libs/gst/pbutils/codec-utils.h"/>
-      <return-value transfer-ownership="full">
-        <doc xml:space="preserve" filename="../subprojects/gst-plugins-base/gst-libs/gst/pbutils/codec-utils.c">The AV1 Codec Configuration Record, or NULL if
-there was an error.</doc>
+      <return-value transfer-ownership="full" nullable="1">
+        <doc xml:space="preserve" filename="../subprojects/gst-plugins-base/gst-libs/gst/pbutils/codec-utils.c">The AV1 Codec Configuration Record, or
+%NULL if there was an error.</doc>
         <type name="Gst.Buffer" c:type="GstBuffer*"/>
       </return-value>
       <parameters>
@@ -3184,8 +3184,9 @@ there was an error.</doc>
     <function name="codec_utils_av1_create_caps_from_av1c" c:identifier="gst_codec_utils_av1_create_caps_from_av1c" version="1.26">
       <doc xml:space="preserve" filename="../subprojects/gst-plugins-base/gst-libs/gst/pbutils/codec-utils.c">Parses the provided @av1c and returns the corresponding caps</doc>
       <source-position filename="../subprojects/gst-plugins-base/gst-libs/gst/pbutils/codec-utils.h"/>
-      <return-value transfer-ownership="full">
-        <doc xml:space="preserve" filename="../subprojects/gst-plugins-base/gst-libs/gst/pbutils/codec-utils.c">The parsed AV1 caps, or NULL if there is an error</doc>
+      <return-value transfer-ownership="full" nullable="1">
+        <doc xml:space="preserve" filename="../subprojects/gst-plugins-base/gst-libs/gst/pbutils/codec-utils.c">The parsed AV1 caps, or %NULL if there
+is an error</doc>
         <type name="Gst.Caps" c:type="GstCaps*"/>
       </return-value>
       <parameters>
diff --git a/subprojects/gst-plugins-base/gst-libs/gst/pbutils/codec-utils.c b/subprojects/gst-plugins-base/gst-libs/gst/pbutils/codec-utils.c
index 87e65272b6..fb49021348 100644
--- a/subprojects/gst-plugins-base/gst-libs/gst/pbutils/codec-utils.c
+++ b/subprojects/gst-plugins-base/gst-libs/gst/pbutils/codec-utils.c
@@ -2425,7 +2425,8 @@ done:
  *
  * Since: 1.26
  *
- * Returns: (transfer full): The parsed AV1 caps, or NULL if there is an error
+ * Returns: (transfer full) (nullable): The parsed AV1 caps, or %NULL if there
+ * is an error
  */
 GstCaps *
 gst_codec_utils_av1_create_caps_from_av1c (GstBuffer * av1c)
@@ -2546,8 +2547,8 @@ done:
  *
  * Since: 1.26
  *
- * Returns: (transfer full): The AV1 Codec Configuration Record, or NULL if
- * there was an error.
+ * Returns: (transfer full) (nullable): The AV1 Codec Configuration Record, or
+ * %NULL if there was an error.
  */
 
 GstBuffer *