diff --git a/coders/hrz.c b/coders/hrz.c
index cf1292c..72e2dd9 100644
--- a/coders/hrz.c
+++ b/coders/hrz.c
@@ -301,7 +301,7 @@
     &image->exception);
   if (hrz_image == (Image *) NULL)
     return(MagickFalse);
-  if (hrz_image->colorspace != RGBColorspace)
+  if (IsRGBColorspace(hrz_image->colorspace) == MagickFalse)
     (void) TransformImageColorspace(hrz_image,RGBColorspace);
   /*
     Allocate memory for pixels.