diff --git a/ChangeLog b/ChangeLog
index f2c029438f..6515df2b29 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+2008-05-17  Sebastian Dröge  <slomo@circular-chaos.org>
+
+	* gst/gstmessage.c: (gst_message_new_error),
+	(gst_message_new_warning), (gst_message_new_info):
+	* gst/gstmessage.h:
+	Mark the debug string parameters as const. Fixes bug #533490.
+
 2008-05-16  Sebastian Dröge  <slomo@circular-chaos.org>
 
 	* libs/gst/base/gsttypefindhelper.c: (helper_find_peek):
diff --git a/gst/gstmessage.c b/gst/gstmessage.c
index 08a03c095f..23389f0ed3 100644
--- a/gst/gstmessage.c
+++ b/gst/gstmessage.c
@@ -341,7 +341,7 @@ gst_message_new_eos (GstObject * src)
  * MT safe.
  */
 GstMessage *
-gst_message_new_error (GstObject * src, GError * error, gchar * debug)
+gst_message_new_error (GstObject * src, GError * error, const gchar * debug)
 {
   GstMessage *message;
   GstStructure *structure;
@@ -369,7 +369,7 @@ gst_message_new_error (GstObject * src, GError * error, gchar * debug)
  * MT safe.
  */
 GstMessage *
-gst_message_new_warning (GstObject * src, GError * error, gchar * debug)
+gst_message_new_warning (GstObject * src, GError * error, const gchar * debug)
 {
   GstMessage *message;
   GstStructure *structure;
@@ -399,7 +399,7 @@ gst_message_new_warning (GstObject * src, GError * error, gchar * debug)
  * MT safe.
  */
 GstMessage *
-gst_message_new_info (GstObject * src, GError * error, gchar * debug)
+gst_message_new_info (GstObject * src, GError * error, const gchar * debug)
 {
   GstMessage *message;
   GstStructure *structure;
diff --git a/gst/gstmessage.h b/gst/gstmessage.h
index 887606223c..2caa85fd5a 100644
--- a/gst/gstmessage.h
+++ b/gst/gstmessage.h
@@ -275,15 +275,15 @@ GstMessage *	gst_message_new_eos		(GstObject * src);
 
 /* ERROR */
 
-GstMessage *	gst_message_new_error		(GstObject * src, GError * error, gchar * debug);
+GstMessage *	gst_message_new_error		(GstObject * src, GError * error, const gchar * debug);
 void		gst_message_parse_error		(GstMessage *message, GError **gerror, gchar **debug);
 
 /* WARNING */
-GstMessage *	gst_message_new_warning		(GstObject * src, GError * error, gchar * debug);
+GstMessage *	gst_message_new_warning		(GstObject * src, GError * error, const gchar * debug);
 void		gst_message_parse_warning	(GstMessage *message, GError **gerror, gchar **debug);
 
 /* INFO */
-GstMessage *	gst_message_new_info		(GstObject * src, GError * error, gchar * debug);
+GstMessage *	gst_message_new_info		(GstObject * src, GError * error, const gchar * debug);
 void		gst_message_parse_info 		(GstMessage *message, GError **gerror, gchar **debug);
 
 /* TAG */