diff --git a/gst-libs/gst/riff/riff-media.c b/gst-libs/gst/riff/riff-media.c
index 08c2c0b248..08b17c9b41 100644
--- a/gst-libs/gst/riff/riff-media.c
+++ b/gst-libs/gst/riff/riff-media.c
@@ -1133,7 +1133,7 @@ gst_riff_wave_add_default_channel_mask (GstCaps * caps,
   }
 
   if (channel_reorder_map)
-    memcpy (channel_reorder_map, reorder_maps[nchannels],
+    memcpy (channel_reorder_map, reorder_maps[nchannels - 1],
         sizeof (gint) * nchannels);
 
   gst_caps_set_simple (caps, "channel-mask", GST_TYPE_BITMASK, channel_mask,