diff --git a/girs/GstVulkan-1.0.gir b/girs/GstVulkan-1.0.gir
index a8ac887baa..40248ae7a1 100644
--- a/girs/GstVulkan-1.0.gir
+++ b/girs/GstVulkan-1.0.gir
@@ -2798,7 +2798,7 @@ See also: gst_vulkan_full_screen_quad_set_blend_factors().</doc>
             <doc xml:space="preserve" filename="../subprojects/gst-plugins-bad/gst-libs/gst/vulkan/gstvkfullscreenquad.c">the #GstVulkanFullScreenQuad</doc>
             <type name="VulkanFullScreenQuad" c:type="GstVulkanFullScreenQuad*"/>
           </instance-parameter>
-          <parameter name="buffer" transfer-ownership="none">
+          <parameter name="buffer" transfer-ownership="none" nullable="1" allow-none="1">
             <doc xml:space="preserve" filename="../subprojects/gst-plugins-bad/gst-libs/gst/vulkan/gstvkfullscreenquad.c">the input #GstBuffer to set</doc>
             <type name="Gst.Buffer" c:type="GstBuffer*"/>
           </parameter>
@@ -2815,7 +2815,7 @@ See also: gst_vulkan_full_screen_quad_set_blend_factors().</doc>
             <doc xml:space="preserve" filename="../subprojects/gst-plugins-bad/gst-libs/gst/vulkan/gstvkfullscreenquad.c">the #GstVulkanFullScreenQuad</doc>
             <type name="VulkanFullScreenQuad" c:type="GstVulkanFullScreenQuad*"/>
           </instance-parameter>
-          <parameter name="buffer" transfer-ownership="none">
+          <parameter name="buffer" transfer-ownership="none" nullable="1" allow-none="1">
             <doc xml:space="preserve" filename="../subprojects/gst-plugins-bad/gst-libs/gst/vulkan/gstvkfullscreenquad.c">the output #GstBuffer to set</doc>
             <type name="Gst.Buffer" c:type="GstBuffer*"/>
           </parameter>
diff --git a/subprojects/gst-plugins-bad/gst-libs/gst/vulkan/gstvkfullscreenquad.c b/subprojects/gst-plugins-bad/gst-libs/gst/vulkan/gstvkfullscreenquad.c
index 366af538ff..20cdf7817b 100644
--- a/subprojects/gst-plugins-bad/gst-libs/gst/vulkan/gstvkfullscreenquad.c
+++ b/subprojects/gst-plugins-bad/gst-libs/gst/vulkan/gstvkfullscreenquad.c
@@ -915,7 +915,7 @@ gst_vulkan_full_screen_quad_set_info (GstVulkanFullScreenQuad * self,
 /**
  * gst_vulkan_full_screen_quad_set_input_buffer:
  * @self: the #GstVulkanFullScreenQuad
- * @buffer: the input #GstBuffer to set
+ * @buffer: (nullable): the input #GstBuffer to set
  * @error: #GError to fill on failure
  *
  * Returns: whether the input buffer could be changed
@@ -940,7 +940,7 @@ gst_vulkan_full_screen_quad_set_input_buffer (GstVulkanFullScreenQuad * self,
 /**
  * gst_vulkan_full_screen_quad_set_output_buffer:
  * @self: the #GstVulkanFullScreenQuad
- * @buffer: the output #GstBuffer to set
+ * @buffer: (nullable): the output #GstBuffer to set
  * @error: #GError to fill on failure
  *
  * Returns: whether the input buffer could be changed