diff --git a/gir-files/GES-1.0.gir b/gir-files/GES-1.0.gir
index 82e566537..e2ded350a 100644
--- a/gir-files/GES-1.0.gir
+++ b/gir-files/GES-1.0.gir
@@ -8498,7 +8498,7 @@ is much more convenient for C programming.</doc>
           </parameter>
           <parameter name="value" transfer-ownership="none">
             <doc xml:space="preserve">the value</doc>
-            <type name="GObject.Value" c:type="GValue*"/>
+            <type name="GObject.Value" c:type="const GValue*"/>
           </parameter>
         </parameters>
       </method>
@@ -8519,7 +8519,7 @@ is much more convenient for C programming.</doc>
           </parameter>
           <parameter name="value" transfer-ownership="none">
             <doc xml:space="preserve">the value</doc>
-            <type name="GObject.Value" c:type="GValue*"/>
+            <type name="GObject.Value" c:type="const GValue*"/>
           </parameter>
         </parameters>
       </method>
diff --git a/gstreamer-editing-services-sys/src/lib.rs b/gstreamer-editing-services-sys/src/lib.rs
index d8fa8a6fd..1ab3674ae 100644
--- a/gstreamer-editing-services-sys/src/lib.rs
+++ b/gstreamer-editing-services-sys/src/lib.rs
@@ -2976,8 +2976,8 @@ extern "C" {
     pub fn ges_timeline_element_roll_end(self_: *mut GESTimelineElement, end: gst::GstClockTime) -> gboolean;
     pub fn ges_timeline_element_roll_start(self_: *mut GESTimelineElement, start: gst::GstClockTime) -> gboolean;
     pub fn ges_timeline_element_set_child_properties(self_: *mut GESTimelineElement, first_property_name: *const c_char, ...);
-    pub fn ges_timeline_element_set_child_property(self_: *mut GESTimelineElement, property_name: *const c_char, value: *mut gobject::GValue) -> gboolean;
-    pub fn ges_timeline_element_set_child_property_by_pspec(self_: *mut GESTimelineElement, pspec: *mut gobject::GParamSpec, value: *mut gobject::GValue);
+    pub fn ges_timeline_element_set_child_property(self_: *mut GESTimelineElement, property_name: *const c_char, value: *const gobject::GValue) -> gboolean;
+    pub fn ges_timeline_element_set_child_property_by_pspec(self_: *mut GESTimelineElement, pspec: *mut gobject::GParamSpec, value: *const gobject::GValue);
     //pub fn ges_timeline_element_set_child_property_valist(self_: *mut GESTimelineElement, first_property_name: *const c_char, var_args: /*Unimplemented*/va_list);
     pub fn ges_timeline_element_set_duration(self_: *mut GESTimelineElement, duration: gst::GstClockTime);
     pub fn ges_timeline_element_set_inpoint(self_: *mut GESTimelineElement, inpoint: gst::GstClockTime);