diff --git a/coders/mono.c b/coders/mono.c
index 4565905..c59cdac 100644
--- a/coders/mono.c
+++ b/coders/mono.c
@@ -315,6 +315,7 @@
   if (status == MagickFalse)
     return(status);
   if ((IssRGBColorspace(image->colorspace) == MagickFalse) &&
+      (IsRGBColorspace(image->colorspace) == MagickFalse) &&
       (IsImageGray(image,exception) == MagickFalse))
     (void) TransformImageColorspace(image,sRGBColorspace,exception);
   /*