diff --git a/ChangeLog b/ChangeLog
index 6a932cff96..a8ec16b451 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2004-08-17  Thomas Vander Stichele  <thomas at apestaart dot org>
+
+	* ext/libpng/gstpngdec.c:
+	  error out on unsupported types
+
 2004-08-17  Iain <iaingnome@gmail.com>
 
 	* ext/flac/gstflacenc.c (gst_flacenc_update_quality): Only set the
diff --git a/ext/libpng/gstpngdec.c b/ext/libpng/gstpngdec.c
index da5e0e994f..f77f0228cb 100644
--- a/ext/libpng/gstpngdec.c
+++ b/ext/libpng/gstpngdec.c
@@ -198,7 +198,8 @@ gst_pngdec_src_getcaps (GstPad * pad)
       case PNG_COLOR_TYPE_PALETTE:
       case PNG_COLOR_TYPE_GRAY_ALPHA:
       default:
-        g_warning ("unsupported colortype");
+        GST_ELEMENT_ERROR (pngdec, STREAM, NOT_IMPLEMENTED, (NULL),
+            ("pngdec does not support grayscale or paletted data yet"));
         break;
     }
     inter = gst_caps_intersect (caps, to_inter);