diff --git a/coders/thumbnail.c b/coders/thumbnail.c
index d291be8..2037dc5 100644
--- a/coders/thumbnail.c
+++ b/coders/thumbnail.c
@@ -205,7 +205,7 @@
   if (thumbnail_image == (Image *) NULL)
     return(MagickFalse);
   (void) SetImageType(thumbnail_image,thumbnail_image->matte == MagickFalse ?
-    TrueColorType : TrueColorMatteType);
+    TrueColorType : TrueColorMatteType,exception);
   (void) CopyMagickString(thumbnail_image->filename,image->filename,
     MaxTextExtent);
   write_info=CloneImageInfo(image_info);