diff --git a/gst/gstbuffer.h b/gst/gstbuffer.h
index 0bf7d8afb5..c6b95a58f3 100644
--- a/gst/gstbuffer.h
+++ b/gst/gstbuffer.h
@@ -462,15 +462,17 @@ void            gst_buffer_copy_into            (GstBuffer *dest, GstBuffer *src
  * buffer is unreffed, the new is reffed).
  *
  * Either @nbuf or the #GstBuffer pointed to by @obuf may be NULL.
+ *
+ * Returns: TRUE when @obuf was different from @nbuf.
  */
 #ifdef _FOOL_GTK_DOC_
-G_INLINE_FUNC void gst_buffer_replace (GstBuffer **obuf, GstBuffer *nbuf);
+G_INLINE_FUNC gboolean gst_buffer_replace (GstBuffer **obuf, GstBuffer *nbuf);
 #endif
 
-static inline void
+static inline gboolean
 gst_buffer_replace (GstBuffer **obuf, GstBuffer *nbuf)
 {
-  gst_mini_object_replace ((GstMiniObject **) obuf, (GstMiniObject *) nbuf);
+  return gst_mini_object_replace ((GstMiniObject **) obuf, (GstMiniObject *) nbuf);
 }
 
 /* creating a region */
diff --git a/gst/gstevent.h b/gst/gstevent.h
index 1a06a98151..5482f1327a 100644
--- a/gst/gstevent.h
+++ b/gst/gstevent.h
@@ -282,13 +282,13 @@ extern GType _gst_event_type;
  * Returns: TRUE if @new_event was different from @old_event
  */
 #ifdef _FOOL_GTK_DOC_
-G_INLINE_FUNC void gst_event_replace (GstEvent **old_event, GstEvent *new_event);
+G_INLINE_FUNC gboolean gst_event_replace (GstEvent **old_event, GstEvent *new_event);
 #endif
 
-static inline void
+static inline gboolean
 gst_event_replace (GstEvent **old_event, GstEvent *new_event)
 {
-  gst_mini_object_replace ((GstMiniObject **) old_event, (GstMiniObject *) new_event);
+  return gst_mini_object_replace ((GstMiniObject **) old_event, (GstMiniObject *) new_event);
 }
 
 /**