diff --git a/libs/gst/controller/gstcontrolsource.h b/libs/gst/controller/gstcontrolsource.h
index 71fb2aae81..04fca18ca1 100644
--- a/libs/gst/controller/gstcontrolsource.h
+++ b/libs/gst/controller/gstcontrolsource.h
@@ -70,7 +70,7 @@ struct _GstTimedValue
  */
 struct _GstValueArray
 {
-  gchar *property_name;
+  const gchar *property_name;
   gint nbsamples;
   GstClockTime sample_interval;
   gpointer *values;