diff --git a/MagickWand/mogrify.c b/MagickWand/mogrify.c
index 0b2e82f..3a43ed2 100644
--- a/MagickWand/mogrify.c
+++ b/MagickWand/mogrify.c
@@ -2198,8 +2198,7 @@
         if (LocaleCompare("ordered-dither",option+1) == 0)
           {
             (void) SyncImageSettings(mogrify_info,*image);
-            (void) OrderedPosterizeImageChannel(*image,channel,argv[i+1],
-              exception);
+            (void) OrderedPosterizeImage(*image,argv[i+1],exception);
             break;
           }
         break;