diff --git a/coders/pnm.c b/coders/pnm.c
index 483bb9b..ba155cc 100644
--- a/coders/pnm.c
+++ b/coders/pnm.c
@@ -1565,7 +1565,7 @@
     if (format != '7')
       {
         if (IsRGBColorspace(image->colorspace) == MagickFalse)
-          (void) TransformImageColorspace(image,RGBColorspace);
+          (void) TransformImageColorspace(image,RGBColorspace,exception);
         (void) FormatLocaleString(buffer,MaxTextExtent,"%.20g %.20g\n",
           (double) image->columns,(double) image->rows);
         (void) WriteBlobString(image,buffer);