diff --git a/ges/ges-timeline-element.c b/ges/ges-timeline-element.c
index bfa3889249..1d12689332 100644
--- a/ges/ges-timeline-element.c
+++ b/ges/ges-timeline-element.c
@@ -1387,7 +1387,7 @@ not_found:
  */
 void
 ges_timeline_element_set_child_property_by_pspec (GESTimelineElement * self,
-    GParamSpec * pspec, GValue * value)
+    GParamSpec * pspec, const GValue * value)
 {
   ChildPropHandler *handler;
   GESTimelineElementClass *klass;
@@ -1401,7 +1401,7 @@ ges_timeline_element_set_child_property_by_pspec (GESTimelineElement * self,
 
   klass = GES_TIMELINE_ELEMENT_GET_CLASS (self);
   g_assert (klass->set_child_property);
-  klass->set_child_property (self, handler->child, pspec, value);
+  klass->set_child_property (self, handler->child, pspec, (GValue *) value);
 
   return;
 
@@ -1428,7 +1428,7 @@ not_found:
  */
 gboolean
 ges_timeline_element_set_child_property (GESTimelineElement * self,
-    const gchar * property_name, GValue * value)
+    const gchar * property_name, const GValue * value)
 {
   GParamSpec *pspec;
   GESTimelineElementClass *klass;
@@ -1441,7 +1441,7 @@ ges_timeline_element_set_child_property (GESTimelineElement * self,
 
   klass = GES_TIMELINE_ELEMENT_GET_CLASS (self);
   g_assert (klass->set_child_property);
-  klass->set_child_property (self, child, pspec, value);
+  klass->set_child_property (self, child, pspec, (GValue *) value);
 
   gst_object_unref (child);
   g_param_spec_unref (pspec);
diff --git a/ges/ges-timeline-element.h b/ges/ges-timeline-element.h
index 7786603d68..a3717014eb 100644
--- a/ges/ges-timeline-element.h
+++ b/ges/ges-timeline-element.h
@@ -287,7 +287,7 @@ ges_timeline_element_set_child_property_valist      (GESTimelineElement * self,
 GES_API void
 ges_timeline_element_set_child_property_by_pspec    (GESTimelineElement * self,
                                                      GParamSpec * pspec,
-                                                     GValue * value);
+                                                     const GValue * value);
 GES_API
 void ges_timeline_element_set_child_properties     (GESTimelineElement * self,
                                                      const gchar * first_property_name,
@@ -296,7 +296,7 @@ void ges_timeline_element_set_child_properties     (GESTimelineElement * self,
 GES_API
 gboolean ges_timeline_element_set_child_property   (GESTimelineElement *self,
                                                     const gchar *property_name,
-                                                    GValue * value);
+                                                    const GValue * value);
 
 GES_API
 gboolean ges_timeline_element_get_child_property   (GESTimelineElement *self,