diff --git a/girs/GstVideo-1.0.gir b/girs/GstVideo-1.0.gir
index d20a9642d8..9fe96dd02c 100644
--- a/girs/GstVideo-1.0.gir
+++ b/girs/GstVideo-1.0.gir
@@ -17785,7 +17785,7 @@ The output caps can be any raw video formats or any image formats (jpeg, png, ..
 
 The width, height and pixel-aspect-ratio can also be specified in the output caps.</doc>
       <source-position filename="../subprojects/gst-plugins-base/gst-libs/gst/video/video.h"/>
-      <return-value transfer-ownership="full">
+      <return-value transfer-ownership="full" nullable="1">
         <doc xml:space="preserve" filename="../subprojects/gst-plugins-base/gst-libs/gst/video/convertframe.c">The converted #GstSample, or %NULL if an error happened (in which case @err
 will point to the #GError).</doc>
         <type name="Gst.Sample" c:type="GstSample*"/>
diff --git a/subprojects/gst-plugins-base/gst-libs/gst/video/convertframe.c b/subprojects/gst-plugins-base/gst-libs/gst/video/convertframe.c
index 58bd3d5c40..64d6a45815 100644
--- a/subprojects/gst-plugins-base/gst-libs/gst/video/convertframe.c
+++ b/subprojects/gst-plugins-base/gst-libs/gst/video/convertframe.c
@@ -409,7 +409,7 @@ link_failed:
  *
  * The width, height and pixel-aspect-ratio can also be specified in the output caps.
  *
- * Returns: The converted #GstSample, or %NULL if an error happened (in which case @err
+ * Returns: (nullable) (transfer full): The converted #GstSample, or %NULL if an error happened (in which case @err
  * will point to the #GError).
  */
 GstSample *