diff --git a/gst/gstbuffer.h b/gst/gstbuffer.h
index caece8da3a..3e448b1464 100644
--- a/gst/gstbuffer.h
+++ b/gst/gstbuffer.h
@@ -141,7 +141,7 @@ G_STMT_START { 					     	\
 #define		gst_buffer_unref(buf)		gst_data_unref (GST_DATA (buf))
 /* copy buffer */
 #define		gst_buffer_copy(buf)		GST_BUFFER (gst_data_copy (GST_DATA (buf)))
-#define		gst_buffer_is_readonly(buf)	GST_BUFFER (gst_data_is_readonly (GST_DATA (buf)))
+#define		gst_buffer_is_writeable(buf)	GST_BUFFER (gst_data_is_writeable (GST_DATA (buf)))
 #define		gst_buffer_copy_on_write(buf)   GST_BUFFER (gst_data_copy_on_write (GST_DATA (buf)))
 #define		gst_buffer_free(buf)		gst_data_free (GST_DATA (buf))
 
@@ -182,7 +182,7 @@ void		gst_buffer_pool_set_active		(GstBufferPool *pool, gboolean active);
 
 /* bufferpool operations */
 #define		gst_buffer_pool_copy(pool)		GST_BUFFER_POOL (gst_data_copy (GST_DATA (pool)))
-#define		gst_buffer_pool_is_readonly(pool)	GST_BUFFER_POOL (gst_data_is_readonly (GST_DATA (pool)))
+#define		gst_buffer_pool_is_writeable(pool)	GST_BUFFER_POOL (gst_data_is_writeable (GST_DATA (pool)))
 #define		gst_buffer_pool_copy_on_write(pool)	GST_BUFFER_POOL (gst_data_copy_on_write (GST_DATA (pool)))
 #define		gst_buffer_pool_free(pool)		gst_data_free (GST_DATA (pool))
 
diff --git a/gst/gstdata.c b/gst/gstdata.c
index 443b60bba0..614950e107 100644
--- a/gst/gstdata.c
+++ b/gst/gstdata.c
@@ -102,16 +102,16 @@ gst_data_copy (const GstData *data)
 }
 
 /**
- * gst_data_is_readonly:
+ * gst_data_is_writeable:
  * @data: a #GstData to copy
  *
  * Query if the gstdata needs to be copied before it can safely be modified.
  *
- * Returns: TRUE if the given #GstData is potentially shared and needs to
+ * Returns: FALSE if the given #GstData is potentially shared and needs to
  * be copied before it can be modified safely.
  */
 gboolean
-gst_data_is_readonly (GstData *data) 
+gst_data_is_writeable (GstData *data) 
 {
   gint refcount;
 
@@ -246,4 +246,3 @@ gst_data_unref (GstData *data)
       data->free (data); 
   }
 }
-
diff --git a/gst/gstdata.h b/gst/gstdata.h
index 36e68dbb0d..0e47a679b9 100644
--- a/gst/gstdata.h
+++ b/gst/gstdata.h
@@ -84,7 +84,7 @@ void			gst_data_copy_into		(const GstData *data, GstData *target);
 
 /* basic operations on data */
 GstData*		gst_data_copy	 		(const GstData *data);
-gboolean 		gst_data_is_readonly	 	(GstData *data);
+gboolean 		gst_data_is_writeable	 	(GstData *data);
 GstData* 		gst_data_copy_on_write 		(GstData *data);
 void 			gst_data_free	 		(GstData *data);