diff --git a/coders/fax.c b/coders/fax.c
index 06de5e6..ecec8b1 100644
--- a/coders/fax.c
+++ b/coders/fax.c
@@ -331,7 +331,7 @@
       Convert MIFF to monochrome.
     */
     if (IsRGBColorspace(image->colorspace) == MagickFalse)
-      (void) TransformImageColorspace(image,RGBColorspace,exception);
+      (void) TransformImageColorspace(image,sRGBColorspace,exception);
     status=HuffmanEncodeImage(write_info,image,image,exception);
     if (GetNextImageInList(image) == (Image *) NULL)
       break;