diff --git a/coders/ept.c b/coders/ept.c
index 2ef8de3..85c64cd 100644
--- a/coders/ept.c
+++ b/coders/ept.c
@@ -430,8 +430,8 @@
         EPT preview requires that the image is colormapped.
       */
       GetQuantizeInfo(&quantize_info);
-      quantize_info.dither=IsPaletteImage(write_image,exception) == MagickFalse
-        ? MagickTrue : MagickFalse;
+      quantize_info.dither_method=IsPaletteImage(write_image,exception) ==
+        MagickFalse ? RiemersmaDitherMethod : NoDitherMethod;
       (void) QuantizeImage(&quantize_info,write_image,exception);
     }
   write_info->compression=NoCompression;