diff --git a/coders/art.c b/coders/art.c
index 677f2fa..eebe66b 100644
--- a/coders/art.c
+++ b/coders/art.c
@@ -309,8 +309,7 @@
     return(status);
   if ((image->columns > 65535UL) || (image->rows > 65535UL))
     ThrowWriterException(ImageError,"WidthOrHeightExceedsLimit");
-  if ((IssRGBColorspace(image->colorspace) == MagickFalse) &&
-      (IsRGBColorspace(image->colorspace) == MagickFalse))
+  if (IssRGBCompatibleColorspace(image->colorspace) == MagickFalse)
     (void) TransformImageColorspace(image,sRGBColorspace,exception);
   (void) SetImageType(image,BilevelType,exception);
   image->endian=MSBEndian;