diff --git a/coders/fax.c b/coders/fax.c
index f424923..665b2e4 100644
--- a/coders/fax.c
+++ b/coders/fax.c
@@ -40,6 +40,7 @@
Include declarations.
*/
#include "MagickCore/studio.h"
+#include "MagickCore/attribute.h"
#include "MagickCore/blob.h"
#include "MagickCore/blob-private.h"
#include "MagickCore/colormap.h"
@@ -330,7 +331,8 @@
/*
Convert MIFF to monochrome.
*/
- if (IssRGBColorspace(image->colorspace) == MagickFalse)
+ if ((IssRGBColorspace(image->colorspace) == MagickFalse) &&
+ (IsImageGray(image,exception) == MagickFalse))
(void) TransformImageColorspace(image,sRGBColorspace,exception);
status=HuffmanEncodeImage(write_info,image,image,exception);
if (GetNextImageInList(image) == (Image *) NULL)